dont bother with mim fenders, you can get much better basses for the same cash, in fact you might wanna look at the vintage modified squier jazz, fantastic necks on those things! maybe a geddy lee jazz?
you can get a musicman SUB second hand, maybe even a stingray if you watch ebay carefully, if your into my kinda sound
theres also a active status shark bass on here for £350, or at least there was, that would be a brillaint bass for you to start out on again