If your into Indie I'd suggest the cockpit near the rail station, not too sure what its like as I'm not a big fan of that scene...more into house ect, however a few friends enjoy it, has a few different rooms with different music on, its suppose to be pretty busy on certain nights, again, not sure which, but you can check on the website for upcoming events I reckon, also Leeds o2 academy is good for Indie stuff, Propaganda on a saturday night is normally packed ! its at the top end of town near the uni's and stuff so theres a fair few students that go ! Good night out...
Theres loads of other clubs aswell...mostly down the bottom end of town ( the top end is more bars that play terrible terrible chart music!! ) - places such as mission/space are a good place to go, you need to look out for events which are on certain days of the week - thursdays are student night so thats when you find that most young people go out, probably the best night I reckon...
Also, probably wont be your choice of music but you'll have to go to 'Halo' on a Monday - £1 drinks all night and like £2 in...Ridiculous !! - I've been plenty of times and cant hardly remember it the day after haha ! - thats basically where everyone goes on a Monday because its right next to the uni's and of course...the cheap drinks ! Always packed out so you always get talking to everyone .
Overall, Leeds is a great place to go out...you just need to know where to go on which days !