Hmm I'm afraid that for a budget of only £500 all you're looking at are the el-cheapo eBay Chinese 3020 machines which do not fulfill any of your criteria.

The simple answer is to get something that does what you want it to then you're looking at £2000 (minimum) plus for a DIY build doing it yourself, ready built then you can at least treble that.

Sorry for no better answer.