I'm glad I'm not the only one who sees Cthulhu

haha
I decided to try out a pair of Cobalts before jumping to the 135 50s (yeah I know, I get a new instrument and i'm constantly on the prowl for the best basic setup) and man these strings are great. The clarity and punch is really something you have to hear in person. It's like taking a blanket off of your amp. I was worried they might be a little too much but they work perfect with the Bongo.
I hate to keep asking questions but you all are fantastic at helping. I'm looking for a new amp that will work well with the Bongo 5 and fuzz pedals (just got a Grey Stache

). I'm using a 5-6 year old Ibanez Sound Wave 100 and even though it's a solid amp I'd like an upgrade. My slightly loose preferences are:
Around 100-200 watts. I usually use my amp in a medium size room so I need to have something that sounds great at any volume, definitely when it's low. 15" speaker would be ideal as well unless anyone has a better idea.
Clear, punchy bass for that low B. The SW100 doesn't handle the low end as well as i'd like.
<$600