A combi or a drill/driver?
I would avoid a combi drill as most will struggle with concrete and hard red brick. You can now get really good quality, lightweight cordless SDS drills from Panasonic, Bosch and Hilti which will take the same batteries as the drill/driver from the same range.
This set has had nothing but great reviews : Panasonic Drill Driver / SDS Rotary HammerTwin Pack EY7441 LZ2S and EY7840X
A decent combi/driver package will cost around £300-£350 for lithium, so it is not too much more for the SDS versions.