Many thanks for the advice. It's not that I don't want to design a custom board, I just don't think I'd be confident enough to do it as my first Arduino project...
The LED strip will be something like this one:http://www.amazon.co.uk/Lighting-EVER-Flexible-Waterproof-Strips/dp/B004JRK35W/ref=sr_1_8?ie=UTF8&qid=1352245506&sr=8-8The sections (i.e individual arduino outputs) will be around 1m each (0.4A) but there may be one that is around 2m or slightly longer.
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