I recorded video from my mini dv camcorder to a DVD and the the quality was better with the analog (RCA) cable that came with the camcorder then the 1394 cable (Belkin). Would it be worthwhile to buy the more expensvie brand like Monster cable ?
I'm inclined to say no - it's a digital signal, so it either works or it doesn't. How are you doing the comparison? If you're viewing on the TV direct from the camera and comparing that with your DVD, you're probably losing something in the editing or MPEG encoding.
Electrons don't care about how big the cable is as long as it conducts well. 1394, RCA, HDMIa cable is a cable if it goes from A to B and isn't broken or susceptible to interference. 1394 was so fast once it's called firewire but it's actually slower than USB 2. One thing you should consider is possibly not having the connection set up properly. Check your System Properties for improperly installed devices and correct them. 1394 is still a reliable and durable connection, despite it's age and digital to digital is preferable to converting analog to digital.