m8 dont buy a heat mat for the side, youll be wasting your money. They do nothing hardly, i have 2 heat mats sat in the spare room doing nothing cos they are crap on the side, go for the ceramic heater, i havent used them myself as my torts are indoor homed but they look like they will work better, they look like a spot bulb without the light. but probably best getting the higher wattage
http://www.petsparade.co.uk/reptiles/heating/?p=1679
and the holder is there too
http://www.petsparade.co.uk/reptiles/heating/?p=2698