i am in the market for a new tig welder but not sure on what type to buy. i have never tig welded before.i have been looking on ebay at the syncrowave250,maxstar300dx,xmt304cc,miller dynasty200dx. i will be welding from 24ga up to 1/4 inch. i would like to be able to weld mild,and stainless steel and aluminum . also i have noticed some have coolers and some dont .please let me know what you think would be a all around good tig welder.thanks