Got me a wee 500W Promethean bass head and 15" cab...
Four sets on Friday (used as backline for three other bands) and two on Saturday and I'm a happy camper indeed ? . Lotsa headroom (it is 500 afterall) and the head and cab together are nice 'n light. Went with an Ibby product because the head sounded better (to me) than comparable Markbass and GK heads and the combo set up works nicely - head bolts onto the cab, and like I said... very light. The GK neo range also had a lot of quality control complaints online otherwise I would've gone for a featherweight cab from them.
Still figuring out how to dial in the best tone for my Jazz but sounded pretty good with some basic EQing, a lot of variables to play with - fun!
Here's text from bassmusicianmagazine.com review! Go to the site for pics.
http://bassmusicianmagazine.com/2011/09/ibanez-promethean-p5115k-combo/
REVIEW for head (10 cab) matched against a Genz:
http://www.bassplayersunited.com/2011/04/gear-review-ibanez-promethean-combo-5110-vs-genz-benz-3-0-310t/