Firstly - Just checking that it is adsl? (Virgin Media also do cable).
Any particular price range?
Is it a long line (far from the exchange)?
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The over-whelming majority of users on this site would recommend the Netgear DG834G due to its stability and ability to cope with long lines and retain sync on problematic lines. Its easy to set up and configure which makes it a firm favorite with many.
If you want another good router to compare with then perhaps look at Speedtouch. The x76 series have a very good reputation and can also do a few things that the dg834g cant if you like to tweak and have a little bit more control.
The Netgear DG834GT also lets you perform some additional tweaks.
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Finally if you are buying then check out the prices via the
Amazon shop. For example the Netgear is currently about £30 cheaper than buying from PCWorld.
Please dont feel that you are obliged to, but if you were going to buy a Netgear anyhow then Amazon are normally the cheapest, and because this site is an amazon afilliate a small % will be paid by them which goes towards maintaining the site costs.