Got a DeWalt DCG413B cordless angle grinder. I haven't used it yet but it seems like a great tool. Got it for under 200$ with a 5 AH battery for free. :
How to Use an Angle Grinder | Angle Grinder Safety
DeWalt DCG409N 18v 125mm XR FlexVolt Advantage High Power Grinder - Bare Tool | DIY at B&Q