I've got a V4BH & USED to own a SVT410HLF so PM(message) me if U want any more info.....
The V4BH IS 100w BUT the 100w is probly as loud as yr 300w Mag. into the right cab anyway. Good amp-not too heavy , loud enough for MOST gigs-has a line out anyway.. BUT IMHO DON'T get the SVT410HLF!!! if U live on 2nd floor! It's a HEavy MF!!! It's heavier than my Bergantino NV610-which has 2 more 10"s, is 12lb (abouts) lighter, is EZ'er to move, thinner(410HLF is THICK-19") & EZ'er to pack & SOUNDS HEAPS better IMHO. If U can get the Sadowsky SA410 cab. it's been discontinued but U can still find a few about, or look at a Bergantino cab. They're KILLER cabs & are FAR easier to move than the HLF. The SVT410HLF was a great cab-don't get me wrong- BUT just SO bulky & heavy-IT injured me a few times in the 2 yrs I had it!- Usually thumb or fingers squashed under 'towel rack' handle. It's a HARD cab to move up stairs too-harder than my NV610!!! Even 2 ppl moving it isn't as EZ as 2 ppl with my Berg! Just the shape-Loved the sound tho!
Bottom Line- if getting the V4BH, U NEED an efficient cab-to get the volume outta the amp. So look at a cab with 100db sensitivity-I think MY Berg is 103 or 102db.... Makes a LOT of difference!
as u r in UK what about the Orange AD200 valve bass amp- s'posed 2 b a beauty!!!