@TheMagicM-
Personally, I think you'd be better off if you can get the A4000, by US prices, at least.
The A2000 sounds like it is a nice computer, but they don't draw as much money as they really should... And 128's and 1571's can usually be found at rummage sales for mega cheap. (I bought mine for a total of $10, I think. They don't go on eBay for much more, from what I've seen.)
4000's, on the other hand, still seem to draw a couple hundred bucks...