there isnt one that will always be uniterupted... wireless will always be susceptable to interference, some products are better than others. If you want uninterupted gaming use a wire if you can if not next best is homeplug then wireless.
I'm using one of these at the moment: Dynamode R-ADSL-C4W-EG, a very nice little modem/router. Performance has been rock solid, the signal is better than my old Linksys and the feature set is just as comprehensive (including the Quality of Service options referred to above i.e. giving priority to gaming traffic).
Excellent value for money.
If you're looking for a more reliable wireless network, you may wish to consider A band capable routers. The A band is less susceptible to interference (Microsoft recommend it for streaming), although it's no faster than G.
As mentioned, Homeplugs are an alternative to wireless. They essentially give you a wired connection.