How about:

Farscape - great show, probably one of my favorite Sci Fi shows ever. Has humor, action, drama, and... puppets (but don't let the last one keep you from seeing it). There are 4 seasons and a movie, Peacekeeper Wars that wraps it up.

Doctor Who - just watched this this year and I love this show. I'm finally caught up through season 5 (of the new series anyway). Tends to be on the silly / sarcastic side of things as well. Seems I enjoy that with my sci-fi.

Torchwood - spinoff of Dr. Who. This one is good, but I'm not all the way through the first season yet. More serious in tone, but still good. Heard that the first season is slow, but that the second and movie are much much better.

Dresden Files - canceled after one season and adapted from the book series. It was a fun show while it lasted. You can watch them online at this point, or DVD. Modern day paranormal investigation. Good stuff.

I'm looking into Warehouse 13 and Sanctuary now myself, but haven't seen enough to form much of an opinion. I dropped the Event, Fringe and Lost, because I got frustrated with them (if that colors my opinion in anyway). The new BSG was good, but I haven't made it all the way through all of those episodes yet either. Needed a break from it.