i disagree, we see them broken on a regular basis.
all depends on how much money you have to spend.
best boiler you can buy is a vaillant eco-tec followed closely by a worcester-bosch greenstar.
if you cant stretch to one of those 2 then a baxi, halstead (expensive spare parts) ideal, ariston are decent boilers.
bottom end of the market you've got heatline.
you then need to consider what power of boiler you need, this is determined by your hot water requirements. the more powerful the boiler the better the flow of hot water you will get. but the more powerful the boiler the more expensive it is to run and you will also probably have to have a new gas supply run from the meter as they burn so much gas.
i would say that for a small 3 bed terrace a 28kw boiler would be sufficient for all your needs, possibly even a 24kw.