You could go for something like this
http://www.diy.com/nav/fix/power-to...-Compact-Hammer-Drill-10957601?skuId=11448305
I have one of those and it's fine for general light work, it's quite light itself.
For general stuff I wouldn't bother with SDS and I would also go for corded rather than cordless as it's a pain charging the battery ready for use, they also don't like infrequent use.
You can go cheaper for non-brand names, aldi and lidl often have reasonable products in but they aren't quite as light. I briefly had a small titan but the keyless chuck broke on it after next to no use, I also have a 2kg SDS titan for heavier stuff but that's probably beyond what you need.