From what I can remember PA38 limit is about 13kts.
I've put one down in a 19kt x-wind with out too much trouble. (caught out by inacurate forcasts!)
I belive the ATR 42 limits are apx - 35kts on a wet runway and 45kts in the dry. (quite impressive)
757 is 40 kts dry and apparently 10kts wet (I suspect this to be a little higher)
A320 is apx 33kts
747's are 30 kts dry, 25kts wet
Some useless info for ya!!