Have you tried hooking it up to an HDTV? the picture will look awesome
The beauty of the HTPC is its power to upscale your Video, assuming you are using your front PJ, you can probably set your resolution to something like 960x540p. Try zoomplayer coupled with FFdshow to further enhance your picture quality.
Regarding the remote control, I dont think there are any being sold separately here. Your best bet would be to add a TV-Tuner that comes with a nice remote, then reprogram your remote with Girder. Too bad had I known earlier I could have ordered an HTPC remote control for you. I just ordered some remotes from the manufacturer, but they already have owners. I can probably add an order for you when we re-order parts from the manufacturer again.
Tons of guides at htpcnews.com you should check it out
You've got a nice setup, but thats only the beggining... wait till you start really getting into it
its addicting.
Next steps:
Upgrade your ram to 512DDR,
Upgrade your Video card to an ATI card (to be able to do 1080i on your PJ)
Go silent!
Silent PSU (Enermax)
Silent HSF (ThermalTake Silent Boost)
Silent VGA Cooler (a lot of brands out there, Id recommend the heatpipe)
Software
Upgrade your codecs (sonic is the best)
Theatertek ($69) or Zoomplayer ($20)
FFDshow video post processor (free)
PVR software (SageTV, Showshifter)
Aesthetics
HTPC Case, to blend your HTPC with your existing AV Equipment
(Accent, Dign, Silverstone, Antec Overture etc.)