Pops,
WELCOME TO THE AWS WELDING FORUM!!
It all depends upon several other factors but if money is even a slight consideration then just start with the process you intend to use. I'll bet that for that money you are looking at one of the 120v welders? Probably wire feed?
Don't try to go too cheap even there. As with everything in this world, you get what you pay for and all machines are not created equal.
There is nothing wrong with getting and using only one machine able to do only one process if you have no need for bells and whistles. Then, just tell us what you went with so we can get more specific helping you with settings, electrodes, gases if needed, etc.
Check out ebay and craigslist. There is need to be cautious but there can be great buys on both. Used and new.
He Is In Control, Have a Great Day, Brent