If it were me, I'd spend the extra hundred bucks and get a V300. 40 watts @ 8 ohms might well be enough for most small gigs, but I like having a lot of clean headroom... An artifact from my bass-playing days, I guess. I use a V300 and on one 75w channel with the volume at about 4 it's good and loud, 6 is deafening. If you're playing with a 1x12 combo, maybe enough power, depending on what speaker you're using. 2x12 probably not, though.
Also, having taken a quick look at the specs on the V100... Can you tell if it has a bridged mode? If you could bridge it, 80 watts @ 8 ohms seems like plenty.