Depends on a few things...
Batch size?
Amount of space you have to brew?
Do you care about bling?
How many fermenters do you need, or are you all set there?
IF I had $2k of funds to spend on this, I'd go with at least one or two large kettles (one for a HLT, the other to boil), burners, build a stand to hold them, keep my current mash tun cooler (70qt so good for even 10 gallon batches) and see where I was at... I would also get either an IC and set it up for whirlpooling, or get a wort chiller that works for where I live. With the stand, if you go single tier, you'll probably want a pump, or two, for moving the wort/water around. If you want to use gravity to move things, then you'll need a multi-level/tier stand... Both options work fine, more personal preference...
Depending on the route you take, $2k might not go very far...