Rolling chassis for less than £300?

[Angel]

I am thinking of acquiring a new kit to play with, mostly for recreational use, though should still be capable of being competitive if necessary.
4wd would be preferable, 2wd is fine though as i am actually more experienced driving 2wd.
I have all the required electrics etc, so the only question is which chassis is most suited to my requirements.
Most important for me, other than competitive capabilities, is ease of maintenance and durability - the less time i have to spend stripping down, cleaning, regreasing, and replacing failed parts, the more time i have for other things like driving .

So, which chassis?!
I am thinking the B44 over the XXX4G+, because of general reputation and is slightly cheaper - but the XXX4G+ does have a shielded drivetrain which is a major plus in terms of ease of maintenance - both the B44 and XXX4G+ have been around for a long time, so may soon be replaced (?), then again they may form the foundation for a conversion to the new 4wd Xfactory chassis.
I like the look of the X6 Squared with regard to ability and build quality, though this is at the top end of my budget.

Help please?