yet another vote for the Trangia stove. i'm using the 25-7 duossal and its great. the cleanest burning fuel i've found is Everclear (190 proof i think) expensive yes, but burns extremely clean and hot. of course, if i used it more than a few times a month i'd probably use HEET or something much more affordable. here's the trangia website:
http://www.trangia.se/