I've been impressed with Netgear DG834GT. Apart from my Texas Instrument AR7 chipset DG834Gv2, the GT has been the only other router I've tried that has synced at max 8128 kbps on my line.
Have tried O2 supplied router (a Thomson TG858v7) and Netgear DG834Gv5 (Conexant chipset), and the max they would do was around 7300kbps on a good day.
If you don't fancy paying a large amount, look for a Sky branded version and the reflash it to Netgear supplied firmware, or one mentioned on this thread.