If you dont mind getting a used unit, it may be worthwhile to check out ebay, I picked up my wndr3700 a few months ago for 40 quid and its been running dd-wrt perfectly ever since. As has also been said the tp-link routers are good value for money only downside being they seem to cheap out on the amount of ram they put in which seems to then limit the devices wan throughput as shown here
http://www.smallnetbuilder.com/lanwa...er-charts/view