The best things ever, are the Bosch Progressor quick change hole saws. Set of those and your laughing.
And for drivers, i love my set of Irazola Techno's. Nice long shafts...... (easy now lads) and sturdy.The long shaft............ Gives you that extra torque to really ensure your terminations are good.
Dewatl 18v combi's are always on offer and usually with a couple of spare batteries, IMHO the dewalt XRP is total and utter garbage, heavy as hell so over head work is a bugger, the gear box's in them are made from balsa wood or something and seem to fail when faced with anything more than plasterboard and i generally feel that for the money for a premium drill as it claims to be, its pants. I would buy 2 18v standard combis that would accumulate 4 batteris in that cost, over an XRP any day with one lithium. But hey, others im sure may love their XRP's, i just seem to have had serious issue with them.
Another handy thing to know is erbauer, although consiered a cheap tool, are actually pretty solidly built, rarely fail, well priced and come to a 2 year warranty in which they replace any tool for any reason next working day and Screwfix, for all their faults, will replace on the spot. Now thats a handy service. Dewalt however, take forever.
As mentioned Knipex are the dogs danglies, but cost a penny, you will never need to replace them, unless some scrot bad half inches em. They will outlast you.