If you are just looking to upgrade the pads (and keep the stock rotors and calipers), I would look at some of the other mfrs such as Hawk, EBC, or Performance Friction.
To maximize your stock rotor/calipers, I would suggest upgrading the pads (eg. Hawk HPC or better), brake lines (Stainless Steel brakelines) and higher temp brake fluid (e.g. Motul). All of that can be done for under your $1000 budget.
Baer does make a kit that allows you to keep your stock calipers and go with a larger rotor by giving you a revised caliper bracket.
After that, you are looking at a rotor/caliper upgrade and as others have mentioned that is going to exceed your $1000 budget (unless you find a used set).
We stock everything you would need for the 1st option. We have used both Baer and Wilwood kits on our race-prepped cars if you have questions on those as well.
American Muscle - Maximum Motorsports - Stack Racing - Koni - Tokico - H&R - Eibach - Hawk - Powerslot