Don't touch British Gas for a new one - they charge hundreds more than you need to pay. Also ... are you sure your boiler is really dead? Although I've just slagged BG off they have a fixed price repair scheme, no fix no fee.
Anyway, I got the Baxi Duo-tec Combi 28 HE as it was a Which best buy. It has been good as gold, although I dispute that a new one saves money, I still believe my 20 year old one was better but BG said it was unsafe because IF it broke they couldn't fix it ....
Anyway, worth a look at Which to see what else is around, or what they say about ones that are on special offer locally. If you're not a member you can join for a tester for a pound or so. Here's what they said about my boiler ....
This combination boiler is efficient, user-friendly and a great choice for flats and smaller houses.
It's one of the few boilers we've tested which reaches the very highest efficiency standards, matching its claims to meet the A Sedbuk standard. As well as offering excellent efficiency, this boiler is also reassuringly easy to use.
Its instruction manuals are well organised and the controls on the boiler are simple too. Helpfully, day-to-day user instructions are also provided in a drop-down panel on the boiler itself which means they're easy to reference when you want to use the controls.
There isn't a timer, but you could ask your installer to add a generic digital timer for a small additional cost.
This boiler is also available in smaller (24kW) and larger (33 and 40kW) sizes.
This model has been superseded by an updated version which we haven't tested but check online retailers for availability
Pros: Excellent energy efficiency, easy to use
Cons: No timer - however, you can get one fitted at the same time.