Waster on an Wednesday at Envy is brilliant. I recommend it.
You know of Route on Mondays.
On Tuesday - I don't quite know.
Wednesday - Waster at Envy
Thursday - Connections at Scandals (also a bit dingy but tolerable)
Friday - I can't remember...yeah, Subversion at The Lounge (EQ), downstairs is metal stuff, upstairs is softer sounds like indie and that.
Saturday - Chaos at South Parade Pier - quite dingy and I think it might be slightly "metal" as well but I went there on a "special" night so I don't know. I enjoyed it though.
As for gig buddies...I have quite **** taste but if there's anything I'm into that you're into and they're playing, I don't mind coming along. I went to see a band in the first 2 weeks of coming here and I had already bought a ticket from home. I knocked on almost every flat in my halls and asked if anyone wanted to come with me. Some people already had a ticket and some didn't, which we managed to buy on the door. You've just gotta ask around. Glad I did or else I wouldn't have found anyone to go with!