That's a lot of money... :-\
I use a 300W Ashdown and never had a problem being loud enough... bigger gigs, just line out - you'd have to anyway.
Only downside to the Ashdown is the onboard compression - it's not great but I don't use compression anyway...
Edit: here you go
http://www.ashdownmusic.com/bass/detail.asp?id=77
2nd edit: I really get all the tonal variety I need, it's warm and growls and doesn't quack like a damn duck.
3rd edit (sorry, feels like late afternoon): you can get one for less than half the price of the Hartke. At 307w vs 350w the actual difference is not that much.