$2500 - What mods should I buy?

LAVA

My Z is a second car and I live in a part of the Country where twisties are pretty much non existent. I do plan on doing some track days but the majority of use will be on the streets which are straight as an arrow here. So I figure making the car faster will net the most fun.

I like the stock Ray's so I don't plan on buying rims, and really don't think I need coilovers. I do want lowering springs to fix the ridiculous amount of wheel gap and the minor benefit in handling they'll provide.

My car only has 10,000 miles so it doesn't need tires yet, I will upgrade them once these wear out.

As far as fluids go It has the GTR spec brake fluid.
ReadT What do you recommend for the tranny and diff?

Sport seats are something I'd like to do down the road, the stock seats are nothing to write home about. Some Recaors would be great. As far as brakes go I have the sport pkg so for my needs they should be more than adequate?

as far as areo kits. I already bought an Evo-r lip and carbon fiber fang cover and plan on buying CF side blades but not with this $2500

Do I need camber kits if I just get lowering springs?

Please add links or brand names of the parts/fluids you recommend.

Thx
Greg