I've never heard of (or applied) a specific go-around speed limit, though I would say that it makes sense not to speed up too much.
Most of us understand that you want to clean up the aircraft as much as possible, but usually after a go-around we want to fit you back in the sequence as soon as possible, partly because it seems fairer than sticking you at the back of the queue and partly because we'd rather you just had a go-around rather than a go-around followed by a fuel state emergency! Going beyond your minimum clean speed means you're likely to be assigned a lower speed pretty quickly...
I can't speak for everyone, but most controllers I know add a bit of extra space when putting an aircraft back in the sequence following a go-around, because we figure once is enough! That can mean that you're likely to be number 3 or 4 once you're heading back downwind, so ALWAYS let us know if a go-around has put you close to minimum fuel.
If the reason for the go-around was an emergency that you wanted to sort out while still in the air (a gear problem springing to mind), all bets are off and we'll part the Red Sea for you - but only if you say MAYDAY!
On a slightly connected note of keeping ATC informed, a couple of weeks ago a crew waited for 5 or 6 minutes after departure to warn of a large bit of FOD on the runway. It turned out to be metal, heavy and about 4 feet long! There had been another departure and an arrival by the time they told us. Please tell us this stuff soonest!!!