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I was going to just transfer my stock tires on that. Think it was 225/40R18 88Y in front and 255/40R18 95Y in back.
Might sell these wheels and get different ones though. Not sure.
Here's my suggestion. Before you sell your stock tires, try everything on ...stock tires on the new rims you already have and the H&R Springs. See how they match up to your expectation of an aggressive setup.
Then you can find out if the tires need to be smaller to prevent rubbing. Or if you need the Megan Camber Kit to meet your camber and toe specifications. Or if the H&R Springs are not low enough for your aggressive setup.
You get my meaning ...you already have the rims, the stock tires and you already decided on the H&R Springs ...so why not try it out. Then you can figure out what needs to change to meet your expectation.
On a side note ...personally I would go with coilovers just so I can adjust the height to my exact specifications.