I'm VAT registered so no real gain with a cash offer and as Jazz has said and what I fear the most buying 2nd hand is a risk.......add to that buying 2nd hand pretty much blind via auction site add to the risk, it would have to be A/ either a known recommended machine at the right price or B/ a real bargain to leave plenty in the pot for the unknown repairs that may or may not be waiting once home and set up........or better still as the conclusion I was/am pretty much at and after taking some superb advice build a machine tp the best of my ability/budget ......this way I'll know the machine inside out for any repairs/maintenance and hopefully gain a far superior machine.
Just gotta put my words into practice now