+1 on miller and thermal dynamics
I have the cutmaster 81 and several miller welders. Hypertherm seems to also be highly recommended for plasma cutters, but I have no experience with them.
The millermatic 211 is a good recommendation. These can be bought for about a grand (maybe less if you catch a special). The only thing I see bad about the MM211 is the low duty cycle. The MM212 has a better duty cycle, but it's more money and you loose the 110v capability. It depends on how you want to use it. If it's going to only be used in your shop and you already have 220V, then I'd probably go with the M212. If you don't have 220V or think you may want to carry the machine to buddy's houses, then go with the MM211.