I have a track car and an LCR - simply fact is the leon is a bit of a boat and you can put thousands in and it will be good but still fwd, heavy and a turbo'd lump isnt ideal to me even though they have a smooth power curve its something expensive to go wrong - For me what i really wanted was a N/A revy rwd fully adjustable car and remember power means nothing if you cant put it down.
If your commited though loose some weight and get it setup correctly - lower isnt always better and good starting point is wishbones parallel to the floor and the stiffest arbs arent always best, you want give in the setup to aid dynamic camber and the tyre patch on the tarmac so get a good book on the subject like speed pro's suspension setup as you will want to make changes and regulary. Big alloys wont
help either id go smaller maybe 17s if you can get away with it and team dynamics pro race alloys which are cheap and R888s arent that bad in the wet if your sensible but a second set of wet weather tyres could give you better feel and save you from crashing if your not comfortable in the wet. Get some high temp brake fluid aswell.
Good luck and have fun with it.
Adam