I agree with cswest, mostly. The pump is last on the priority list.
If you are doing full boils with your current pot, then go with the stir plate.
You'll notice that I said "mostly". We didn't discuss finances at all. You can build a stir plate way cheaper than you can buy a pot. I built mine for less than $10 with parts I had laying around. I only ended up buying some magnets and a potentiometer.
See this thread My Stir Plate . . . cheap and easy build
I use an 8 cup (2L) pyrex measuring cup that I already had instead of buying a flask.
Of course, you can make a keggle out of a 1/2 bbl keg for about $30 too.