Advice on B4 motor/esc setup

[The Bod]

I have just purchased a used B4 off Ebay to replace my ancient Optima Mid. I was very surprised to see that the Mid is a hell of a lot faster than the B4 which leads onto my question.

Could someone offer some advice on what motor/esc setup I should be aiming for in the B4? Which makes to avoid? I am a relatively newbie so concious that speed probably isn't everything at the moment, but would like a system that can have motors upgraded. Should I stick with brushed motors until up to speed? If so, what size would be best?

The Optima Mid is running Lipo with 16x brushed motor (20 years old!!!). The B4 came with a LRP Ai Runner reverse (see pics in album) and a standard brushed motor.

Thanks to all