Im not "clumsy" at all, been riding for about 9 years and not had problems before. I do think its the age of the wheel, as the front wheel got replaced about a year ago due to theft, and its been fine. Not really bothered about getting custom built wheels as its a fair bit more expensive I would have thought, and factory wheels are tensioned by a machine I would imagine, so would be better.
Rebuilding the current rim isnt an option, as the hub is cheapo, and by the time you buy new spokes and get them built, it would be better and cheaper to get a complete wheelset. Will look at the wheels mentioned, thanks for the advice all.