I was in the same boat as you mate. Sold my last bike due to kids/house, then decide i just HAD to get another. Had an RGV like you & really fancied another 250 2-stroke, and fell in love with the NSR (cos it was a little different). I bought an 88 MC18 off of eBay for £250 which had a seized piston a few months ago. Rest of the bike seems sound (fairings not too great, but all there), still waiting for my bloody piston kit to turn up
The thing is i've probably spent another £400 on it since the initial £250 outlay, so buying a cheapy isn't always best. But in my case i'd rather spend as i go (cos i'm skint) & didn't have a spare £1500 to buy a half decent MC21.
But what ever you decide, good luck & stick around
Skoot.
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88 NSR250 R2J (work in progress!) & 05 Aprilia SL1000 Falco