Yes I have a Old 3Com that I connect a Wii two Laptops and Two Desktops without any Problems. This one a 3Com - OfficeConnect ADSL Wireless Router its a g router but should be fast enough for your needs click here#
Check ISPs free new sign up packages, even if you don't want to leave Talk Talk.
Various compare and meerkat (car insurance??) sites, whatever, will give you comparisons.
Then phone the right Talk Talk cust svc number. See Yellow Pages. Be honest and explain your problem. Don't threaten to leave, but leave it implicit. (You are already armed with what the competitors offer)
Worked for me with AOL last year.
Nice new Thomson 585 V6 modem/router (W7 compatible) pcm down from £17.99 to £9.99.
I had to commit to another 18 months. But AOL works fine for me (LLU exchange)