Alright, I guess I really meant a few days.
I'd first of all recommend saving up for either Native Instrument's Kontakt5 or a big chunk more for Komplete, as it's a great place to start, has more instruments than most people need, and will make acquiring a good number of unique libraries in the future a lot easier. In addition to the usual bunch of EPs and flexible (drawbar-equipped) organs, Komplete comes with four different types of pianos with several variations each, and they're quite useful. More on that later.
Although I don't own Alicia's Keys, tracks I've heard with it have proven it to be a really great package. I've played about a dozen Yamaha C3s and C5s over the years and think Yamaha really does have the best pianos for
modern players, being really dynamic, yet warm and tight without the glorious boominess of many Bösendorfers or the extraneously resonant bright end that characterizes Steinways. NI did a really good job deep sampling the C3, and the thing seems to blend quite smoothly with other instruments. It's pretty much on my next purchase list, although I kinda have trouble justifying buy it with what I've already got.
I go between three different types of pianos, depending on what the project arrangement requires, but often I'll tweak things to come up with something more functional. For example, if I want a quaver/eighth-note triad to band away on the upper end of the keyboard on a rock track (a la the Kinks or Blur), by default I'll go to one of NI's classical pianos and bounce it to a separate track, and then run a send to some compression and a slow chorus, to fatten up what would otherwise be too thin and edgy of a line.
In a nutshell, my personal recommendation: Native Instruments' Piano Collection (Included with Komplete). $149 gets you a lot of piano for the money even if you buy just the Collection, with a good range of timbres and tonal control.
This demo video should give you a good idea of what to expect on their own.
1. NI New York Concert Grand - I tend to use the New York Concert Grand a lot, because it simply blends well. A tad on the bright side, but the crispness allows it to cut through thick mixes nicely and it serves its purpose really well. In the
IFA Bada Promo it sounded really interesting with the addition of the
8Dio Hang Drum, and of course with the brightness it works great doubling string lead lines, which is what I did with the Smart TV ad with all of those
charming Ukranian kids, as well as more percussive right-hand lines
in this Nexus trailer for IFA 2011.
I've found both the Berlin and Vienna pianos from the NI Piano Collection very nice on their own for classical stuff, rich and bright with nice natural ambiance, but not the best for pop or other modern arrangements, coming out tinny and with excessive clang when pushed in louder mixes.
2. NI Upright Piano - From clunky indie tunes and bar pianos to some of Ben Folds more intimate moments, this thing sounds really good. It didn't take long for me to be convinced that I didn't need a grand piano all the time, and the intuitive tuning presets allow both equal tempered scales as well as a number of stretched and detuned settings to emulate "that piano" sound. Doesn't have a lot of power when competing with other instruments, and the predictably weak decay of an upright's notes can't be especially improved with either the internal reverb or even some of my best DAW reverbs (as good as MOTU Proverb is), but the charm is in the weakness itself. Play along with an album by The Decemberists or The Thrills and it all makes sense.
3. Soundiron Emotional Piano - Romance, tension, spooky stuff, this thing has it. Warm and slightly broken-sounding, there simply isn't a better model for slow sections that need space and depth. It's much too dark and the decay isn't really suited for very fast attacks or hard playing, but if it's kissing and other mushy delights, you win. I've used it all over Samsung stuff, most notably in the 2011 IFA
"Fragrance by Samsung" teaser I had so much fun with. This thing is in at least half of the 25 tunes Cindi and I are wrapping up right now for our upcoming double album, it's effortless and very expressive in quiet music.
I also frequently use the incredibly creepy "Old Distant Piano" preset in Omnisphere, but usually just for single lines. Really heavy and full of reverb, it can hold its own well even with sparse usage, but gets boomy even with triads.