[Desmodus]

VFC is pretty much the go-to choice for an M4 platform. You definitely cannot go wrong with one of those.

I can't comment on the VFC MP5... I don't know a whole lot about it.

Changing to a TB isn't a bad idea, but that upgrade really shines when you also have your barrel group (ex: hopup) upgraded as well.

Have you considered short AK's? Look into an LCT or an E&L AKS74U if it tickles your fancy. They are about the same size as a collapsible stock MP5 and are steel-bodied.