Why can't you save up a little bit more and buy what you want? For example, you'd pick up a perfectly good Marshall head second hand for only a wee bit more. When it comes to your gear, if you buy cheap you will always end up buying twice, honestly. I bought a second hand Engl head 7 years ago or so, and although it was dear, I've never had to upgrade. I picked up a JCM900 head a few years later as a touring backup and it wasn't much over 350, but the only thing that would make me change my setup now is if I decided I wanted to downsize to a combo. Save up for the right amp and avoid interminable internet threads about swapping, changing, modding or hunting for alternative gear.