I haven't owned that many amps, and it's hard to advice when the criterias mentioned by the poster two posts above is not mentioned by you.
For all it's worth though, I'll mention a few of those amps I owned that stood out, for better or worse:
- I loved my Ampeg B-15 60 W tube amp (A great warm rounded tone, with capabilities of getting quite aggressive as well), though it would probably be too small for your needs.
- Hated my Hartke 120w solid state Flipback combo, worst bass amp ever! (Sounded dull and uninspiering, wasn't capable of either adding any warmth or aggressiveness to the tone, just plane boring and bland)
- And finally I love my current amp, a Trace Elliot solid state 130W combo (Which I will describe following).
The older Trace Elliot solid state amps can be acquired relatively cheap used, and is great value for the money.
I simply love the sound it is able to produce.
While it is capable of reproducing a wide variety of tones (most Trace Elliots has two pre shape EQ voicing buttons, a graphic EQ, as well as an overall EQ voicing knob that goes from emphasizing the highs to flat to lows), it is really good for a great punchy and defined tone, even with the one 15" mine comes with, although I played another 220W, I believe, Trace Elliot combo that I liked even better since it came with 4 10".
This amp even makes the pickups of my Ibanez Mikro, which are ok, but still leaves some to wish for, sound fantastic.
Also it seems to be able to play crazy loud for the claimed wattage.
My recommendation, without knowing exactly what you are aiming for though, would hands down be an older used Trace Elliot combo or head and a 4 10" cabinet.