HOT5's look good. But for the coverage and cost, a HID is cheaper overall. For heat, well, the T5s I've checked out at hydro shops around the country have been kinda hot. Not just the ends either. But I think a HID will still toss out a lot more heat.
If for a small personal grow, say 6 1/2oz plants, the T5 might be best
If just for veggin, pretty much anything will do *well*, with the proper 'color temp' bulb.
The link in my sig might help a bit