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It's a pretty straightforward decision. If you have 2 bathrooms or less and want to loose the water tank a combi boiler will suit you. Valiant are very popular, easy to get spares, plumbers know their way round them, last well enough.
For a flat with 1 bathroom a smaller output will do, if you like a generous flow rate in the shower then get a slightly bigger boiler. Your existing radiator system should work with the combi, power flush the rads.
It is great to have hot water on demand.
Still looking for conventional boiler to combi advice.
Bueller...