I went for the fast road setup that ABP offer (Stormster I think this would be very close for you as they are just up the M6).
I wouldn't lower it personally, its "just" about right for the road bumps around here. Go with a stiffer ARB at the rear / fast road set up and if the shocks aren't tired you will still make a lot of cars look silly in the corners on track.
Just point of note re: fast road setups, if you intend to lower get the rear camber arms not bolts as they won't have enough adjustment the bolts for a 30mm drop.
I've used ABP for my s14's drift setup and although they have their own settings for tow camber etc please note these are conservative in order to keep tyre life sensible. You could wack a lot more negative camber on the front for example. I just went with the FSR to be honest as I do a track day once every 2-3 months, the main thing is that you'll find all your geometry it pointing in different direction and just getting things aligned makes a big difference to the drive of the car.
Tim is spot on re: brakes only thing I've done is change the front pads on mine for DS2500's so they don't die after three laps. The standard brakes are tough and if you warm them up properly you won't warp or damage them. Plus they are cheap to replace if you need to. I also put braided steel lines on mine and removed the shims to get rid of any slack in the system but thats all.
Magnex as mentioned are a bit pants, just get a 2.5 inch mid pipe if you must and keep the standard rear box. I can link you if needs be to a guy who makes them on the CTR forum.
If noise is the order of business go have a listen to a few on youtube. DC sports, Spoon, HKS hi power and custom jobs seem to be what people go for. Too rich for me though

ABP do a cracking piper exhaust but the looks are marmite.
I went for a mongoose rear box and a custom mid pipe with extra silencing, simply because I needed to keep the DB's down for noise regs. Mongoose is also pants but I didn't get it for the looks or sound I just know they last well enough (10 years on my s14), are functional and dirt cheap.
Just remember 2.5" for an NA engine and then if you strap forced induction to her go for a 3" pipe.