In my opinion the Pre Cursa (complete bike) is the best value for money on the marked today for an "entry level" track/fixed gear bike; bought one last year for everyday use. That said, while I can't really fault the stock components in any way, I only road it for about a week before rebuilding it virtually from scratch. I'm terribly picky like that, but like I said, I can't really fault it. In your case, budget being an issue, I would definitely buy the complete bike and upgrade as you go on a need to basis.

PS
Dolan are not likely to have an end-of-season sale, but other UK/EU retailers might; you could get lucky, but personally I wouldn't bet on it. Also you might want to consider buying second-hand?