I'm watching SG-1 now for the first time, see the Stargate forum, and am enjoying it immensely.
Babylon 5 is on my list as well, I've not seen it so I'm not voting. I'm already committed to watching it though. Got all 5 seasons via wb.com having a great sale last year, got some season sets for as low as $7!! I'll be watching B5 sometime in the next 6-9 months.