Congrats on the decision! You wont be disappointed with that body.

I would say go with the kit lens for now and then figure out what you really feel you need. You can always sell the kit lens on ebay for a good price(I got $75 for mine) and put that towards the upgrade. Maybe jessops will even take the kit lens for a store credit exchange, im not sure. I was fine with the kit lens for a few months and then upgraded when I found myself limited.