You're not going to find much in that price bracket with all the options, and the ones you do see are likely to have some issues. I've been tracking prices for a while now, as I'm thinking of selling mine, which is a 57 plate SE with ~70k, and private sales are listing between 6-6.5 in normal condition, about 1-1.5 more than that from dealers.
As far as what to look for, full service history and recent MOT (were advisories done?) is a start, but I tend to look at the tyres, appearance and general cleanliness. A 200bhp car on cheap ditchfinders screams to me that the owner hasn't taken care of it. Mismatched or very worn tyres tell me that not only do they not care, but they haven't been able to afford the upkeep, so the oil will be old, the filters will all need changing, several brakes will have seized/worn to nothing and I can expect to find a whole host of broken or worn parts (e.g. leaking shocks, MAF sensors, budget repairs). Given a good set of tyres cost over £400, oil & filters £100, and respraying just the bumpers & bonnet ~£500, it's very easy for a 'bargain' to turn out being the most expensive car listed. If there are more serious issues, then you can be looking at a lot more than that, hence my caution in the first sentence about 'issues'.