I installed Borlas about a year ago and they are awesome; best mod I've made so far. As you know they are stainless steel, will never rust out and have a lifetime warranty. Trust me, as difficult as the installation is you don't want to have to replace some rusted out headers every couple years.
Also, header wrap does make a HUGE difference in under-hood temps. I think I got the Thermo-Tec brand from Hi-Lo but you can get it at most parts houses/performance shops.