Gauge Aluminum Brazing

I am looking into buying a TIG welder. I have little knowledge of the art of welding beyond brazing but I am eager to learn.

I found http://tboltusa.com/store/product_info.php?products_id=808 this tig online and it looks like a good option. It seems to also have a 50 amp plasma cutter which excites me.

I am looking into welding pieces of aluminum together. Right now 16 gauge is around my thickness. I might be using a bit thicker at times. I know a bit about argon gas and how it works in lowering the amount of amps needed and also decreases the likelihood of porosity. I plan on using 100% argon all the time, unless there is a reason against it.

http://www.toolsurge.com/prodView.asp?sku=LE-84260 This is another welder that looks like a good bet for my needs. I am also considering looking into acquiring a used one, probably from someone on craigslist, but I don't know enough about tig welders to really be able to say yes or no to one.

Thank you!