Actually there can be a HUGE difference between cards. Most PCI cards are the same, but I've seen some as low as 160x120. Normal DVD res is 720x480 for DV, or 640x480 for you're standard analog.
Probably the best way to go(if you don't mind spending about $250) would be get a DV/firewire card, then find some DV Bridge. That's what I do... The quality is wonderful, it's easy to edit if you'd like, and you can send it back out to you're TV/VCR. Or, of course, you could convert for VCD/DVD burning.
Desktop: Athlon 64 3700, 1024M RAM, GF 6200 TC 256M, 2x 80G, 2x DVD-RW
Laptop: Sempron 2800, 512M RAM, Unichrome, 60G, DVD-RW
Macintosh:G4 1.33GHz, 512M RAM, Radeon 9200 32M, 40G, DVD/CDRW
They get me from 0 to 1...