good grief that TC RH450 is spendy... makes me wonder... What DO these little beasts cost...
TC RH450 @ Zzounds: $999
MB F1 @ MF: $699
EA Iamp Micro @ Bass Central: $675
GK MB2 500: @ MF: $499
GB Shuttle 3.0 @ MF: $549
GB Shuttle 6.0 @ MF $699
Carvin BX500 @carvin: $399
Lot's of great stuff. The TC is worth every penny to me, and I totally dig it. Also, be aware that there is a more fully featured F1 called the F500 that sells for the same price as the F1 (although they might be discounting the F1 now a bit since the F500 came out). Both are amazing heads, and IMO at the top of the 'small and light category, depending if you want very clean, quick and 'accurate' (F1/F500) or fat, warm, meaty, full, and LOT's of bells and whistles (TC RH450).
The Genz Shuttle Max heads and the 9.0 are quite impressive too... not as impressed with the 6 and 3 myself, compared to some of the others.
GK... too much reliability drama. Carvin.... haven't tried, but the B2000 (10 pounds, the amazing B1500 front end, plus a tube and 2000 watts for under $800) has to be the best spec on the planet for a bass amp... period. If it sounds anythign like the B1500, that might take the top spot for 'price/value' away from the amazing Markbass LMII/III.
I love my TecAmp Puma500 also, but at around $1,200 in the US, that's a bit of a 'mister money bags' sort of purchase... hard to recommend if you are looking for a meat and potato type of gigging amp and watching your pennies.