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.
what can I do for a reliable method of temp control for my mash. I currently mash in a 5 gallon round Rubbermaid cooler. I also have no method of automation on my system as I am new to this hobby of addiction, and my system is kind of ghetto.