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This design hasn't changed since the early 80s; if it ain't broke...
I've had one for about 15 years.
http://www.makita.ca/index2.php?event=tool&id=181&catid=3 -
Probably would opt for a hand operated one if I wanted to spend less than £50, or maybe one of the old Makitas (6095 I think) with the long thin batteries and get a couple of new batteries.
I use 2, Festool CXS and Festool C15. They use a special system for bits/drills called centrotec which helps to combat runout and the C15 uses a brushless motor.
They're probably overkill for diy use but you can pick up the cxs on eBay for circa £120 used. They are very reliable so I wouldn't worry much about buying 2nd hand. Try to get the set which has a right angle attachment, saved me on many occasions.
Beware of drinking the Festool koolaid, it's a slippery slope.
Wise experienced DIYers and professionals alike (I'm looking at you @Airhead) I need recommendation for a decentish drill to replace my £10 Argos one. Nothing too expensive really.
All the thanks.