They aren't that expensive, now would be a good time to uprate iof your going to be tuning the engine. Im pretty sure £90ish will get you an uprated item.

Fitting isn't that hard at all, a little fiddly in a couple of areas but generally easy - however........you also have the added weight of 20 odd litres of petrol

I would get the tank off berfore buying a pump though, could be the rubber damper from the pump split