It may not come as a surprise but nearly all the big brand name power tools use the same motors and batteries inside.. they buy them from OEM manufacturers such as toshiba or samsung and then put their own plastic cases over them and charge more with every reincarnation.
If you want a good make to try at a very affordable price, have a look at
http://www.cel-uk.com/
They have very very good customer service and will even let you pop in to the warehouse to try before you buy...
You can currently buy a cordless SDS plus drill with battery and fast charger for ÂŁ56 all in. that is very very good pricing and the quality is pretty good too, dont be put off by the 14.4v either, its all to do with gearing and torque apparently that determines the true power output. I have been using there tools the last year or so doing building work before coming back to electrics. I can't fault them, they last longer than dewalt and seem just as if not more powerful.