^ i agree... you aren't saving money if you buy an £800 amp and 6 months later end up buying the £1400 anyway! of course, if the £800 one does exactly what you want, that's a different story...
The avenger i tried was second hand (i was extremely lucky to even get to try it, it was just chance they had one in stock the day I was in)... i think it was something like 1300 euro, which is about £800? so I'm guessing the new price (bearing in mind prices in the south of ireland have shot up with the introduction of the euro) would be somewhere in the region of £1300-£1400? i think the hot rod might be within budget, which (as far as I'm aware) is twin channel, but it might sound completely different to the avenger, as I haven't tried it.
Just when you said "fizz", it made me think of soldano... i'd have described it as a cornford with a little more fizz and presence. and cornford would have been close to what you were describing before you mentioned "fizz".
as ever, though, anything you can get your hands on is worth a try. cornford may be fizzy enough for you, etc.