The 970 at $299 is an excellent deal but will need an amplifier too. HTPCs are not as flexible as the 970 when it comes to hookups and may be more of a pain than $299 shelled out. If you are going to use your PC as the Pre/pro you will still need an amplifier to drive speakers. The output of your HTPC would go to the input of the amplifier and the output of the amp to whatever speakers you select. Spend your $$$ on speakers if you have to stay within a budget. Your listening space will likely dictate the size of the speakers and they will dictate the size of the amp. Very good setups can be had with small speakers supplemented by a subwoofer. That allows you to go smaller in the amp area because subs are usually self-amplified. Go to listen to speakers with your favorite music if possible. Many internet speaker companies will let you audition their speakers in your home for 30-60 days and if you don't like them send them back. Outlaw, Aperion, Axiom are a few that you should check out. As far as amps go you will not get a better deal or customer service than Outlaw. Right now you can get the 970 and the 7025 amp for $799 plus shipping.
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Music system
Model 990/7500/Magnepan 1.6 QRs/Technics SL1200 MK2/Aperion S-12 Subwoofer/OWA3/Sony NS75H DVD
APC H15 Power Conditioner

TV System
Large Advent Loudspeakers/ Polk center/Monoprice surrounds/Panasonic Viera 42 inch/Onkyo HT-RC260/Sony BDP S590/Directv


Home Theater System
Onkyo PR-SC886/Outlaw 7125 Klipsch RF-82 L/R,RC-62 center, RB-35 SR/SL, BENQ HT1075, Outlaw LFM1-EX/OPPO BDP-83/Directv
Harmony ONE
Blue Jeans and Monoprice interconnects
APC H15 Power Conditioner