88 hammer weighted keyboards
I would separate the "Speaker" and the "Keyboard" equation, there is too much of a compromise trying to get both in one. The speakers in a keyboard are primarily meant for the player to hear, not an audience. Look for some small powered monitors for the audio portion of your programme that can double as computer/other instrument audio monitors and as small-room audience speakers. I use ESI nEar 05's.
My favourite 88 key controller in your price range is the Roland RD100 piano. Great feel and a killer piano sound, easily the best piano under CAN$2K (it's under $1500). Looks like they have replaced it with the RD170 now
http://www.roland.com/products/en/RD-170/index.html
The RD100 isn't a superb MIDI controller, as it does not have the extra knobs and sliders for controlling soft synths and sequencers. But Evolution, Peavey, Kenton and JLCooper all have stand-alone MIDI controllers, or get a second "shorty" USB/MIDI controller keyboard from M-Audio, Evolution or Edirol that has the knobs. Then you can comp on the piano and wail on a solo synth part like Emerson.
Other options:
Korg has an 88 with built in speakers for CAN$1500 you might check it out.
http://www.korg.com/gear/info.asp?a_prod_no=SP300&category_id=1
The M-Audio Keystation 88 is a soundless controller keyboard with a weighted 88 key action It is very well priced (about $800).
http://www.m-audio.com/products/en_us/KeystationPro88-main.html
You'd probably want to invest in a hardware sound module to go with it -- for straight playing, computer-based samplers and synths do have a lag time of between 5ms and 50ms depending on the speed of the computer and the audio interface, which can be an annoyance. Hardware sound modules are faster to respond.
I don't like the touch on the Kurzweil 88's one bit - or the build quality.
If you want a full synthesizer keyboard as well as piano, you might like the Alesis QS8.2, but it will be off the top of your price range with speakers.
http://alesis.com/products/qs8.2/
I don't know of any other 88 weighted key synthesizers under CAN$2K
Yamaha's touch is good on the P90 and S90 but I don't like the velocity cross-fading on their "Rhodes" electric piano sound, which is a deal-breaker for me.
If you have played a real Rhodes, you know that the tone changes from bell-like when played with a light touch, to a meatier sound, to an outright bark and growl when you slap it hard. To check the realism of the sound on a digital keyboard, repeatedly play a note, gradually increasing the strength of the strike. The tone should smoothly move from bell to growl, not abruptly switch between the two tones.
Thanks
Trevor