Oh please
Any 7 or 8 speed (Non-DA) STI levers should work just peachy with what you have. If you use 8 speed levers on a 7 speed cassette you will have one extra click that doesn't do anything, but the spacing is the same. Depending on how your chainstay clearance looks, you can also just replace the 7 speed cassette with an 8 speed cassette. You'll need the levers, stops that bolt on to the shifter bosses and new cables/housing. That's it, I can't begin to guess at the reasoning that would have you swap the entire drivetrain, the tri-color series included STI levers for pete's sake.