+ on the use of a large tip, to better hold the temp up, on larger wires. And technique is important, proper tip maintenance, use paste flux, etc. The tutorial mentioned, kinda lengthy but some really good info:

http://www.rctech.net/forum/radio-el...ef-lesson.html

As far as your question, I also agree, the 936-13 (large tip model) is well proven. But that new fugly job would probably work fine too, just might need a bigger tip, not sure which one it comes with. The smaller size would be nice.