Well you came to the right place, it's what we do here.
I'm not sure what the whole PVR thing is about, I'm sorry. So I'll just put the components for the computer for around 800$, so buying the PVR cable input cost has a 200$ budget.
I chose this processor simply because it's the best out there for the money, in gaming and other things. It's a good bang for the buck cpu; you could always get a better one but this one should do.
AMD Athlon 64 3700+ Skt. 939 Processor.
Okay, some people are going to tell you to get a DFI Lanparty motherboard, but don't bother if you aren't going to overclock. This motherboard is very nice, I have one myself.
MSI K8N Neo4-F Pci-E Motherboard
Well since you wont be gaming much, I'd say get a 6600GT. I do game and I have the 6600GT, and I love it. So just think how it will perform for you if you're not doing as hard of gaming. If you think you'd need a better one, you can change this for a 6800GS for about 200$.
Don't cheap out on your powersupply, but in the same sense don't buy one with too much power that you wont use it. I'd say go with a Fortron Source 450W w/ Dual 12v rails (18a on each one). It's a very stable powersupply and should do fine.
Fortron Source 450W PSU
You probably should get a good amount, so I thought a Gig should do fine. It's pretty much standard with most programs nowadays (mostly games). This memory is very nice for the money, and comes with a lifetime warranty.
Patriot Signature Series 1Gig (2x512MB)
Well it seems as though you'll be needing some space, so I thought a 250Gig would be nice. Seagate is a good brand, but try and stay clear from Maxtor.
Seagate 250Gig 7200RPM 8Mb Cache
Well you don't sound like you need some crazy good soundcard, so the Soundblaster Live should be fine. I have one myself and it sounds very nice on my 5.1 Speakers.
Soundblaster Live! Soundcard
You can't really be picky with these, so I just linked a random good one.
Lite-ON DVD Burner
Last but not least, the case. I suggest getting a sturdy case that you like. This is mostly personal preferance, so the choice is yours. Just be sure to get an ATX case and look for some reviews for it.
So this will come to about 750$, with the case around 800$-850$ before shipping.
Hope that meets your requirements, if you have any questions feel free to ask.