#2
check out thomann as well, they are generally cheaper. www.thomann.de
i would recoment getting a bigger cab, if not then get the 2500 cos the second one is too powerfuul and could potentially blow your cab.
#3
the 3500 is really nice. idk if the cab u have there would b capable of the 3500's power
(Main)Gear-v
Jackson Dinky DKMGT
PRS SE Paul Allender
Peavey 6505+ 112
#5
You could get another cab for the 3500. The other option, if you're skint, is just to use the 3500 with the cab alone. As long as you don't push the amp above 3/4 you'll be fine with 50 watts of overpowering. You just have to be really mindful. Either that or just go with the extra/larger cab.