The Dart 16's and 18's are pretty well proven boats in the UK, have large class orgnaised meets and races, good backup on spares and the 18 easily handled with 1 biggun. Got to be looked at as they are great value for money and you often see them under a grand with trailer and all the kit.

If you really want a blaster then how about

http://www.ebay.co.uk/itm/330902305977?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

got to be the ultimate big boys blaster and people do sail them single handed.