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I know I'm jumping into the discussion a little late (just cause I have a hard time trying to decipher your posts, but... I won't hold it against you), but I was pretty close to the same position you are in now about a year ago. What I decided to do was build the car from the ground up. What you need to decide prior to buying all the parts or even thinking about the parts is how much power do you want to put down to the road. What's your main focus with the car (or as I like to put it, the over arching philosophy)?
For me I wanted my end result to be able to put down anywhere from 400 to 600 hp and still be reliable. This means that I will have to pay alot more than most people to get it done right. Once I set the power level and what the use of the car would be I wanted to make sure I wouldn't have to go back and redo more than I had to later on (unless I wanted to). With that mentality I aimed specifically at the suspension first.
With your suspension, what do you want? You want to be able to brake all that power in a controlled manner. If you're HP goals aren't going to be Huge (read that at anything more than 350+ or so) then your stock brakes are fine. Honestly speaking there is no need to go to a large brake kit for the most part even if you exceed that rule of thumb. Just get new pads that are better than stock.
Next you want to look at your tires. Is your foot print big enough for your power? That's pretty easy to verify, up it. Granted some people run over kill on their cars, but they're in racing--so they need that extra grip.
After that look at your suspension geometry, do you need adjustability? Do you need stiffer spring rates? Do you need camber? Do you have or do you want to eliminate DTSS? These are things you should look at prior to your engine specifics.
Once you have your suspension dialed in it's time to look at your engine. You want high compression rotors from an S5. Why? They're not that big of a compression increase from S4. If the extra .2 of the ratio is worth it, then go for it--just remember that the majority of the horse power increase comes from the VDI, not the compression ratio. Beyond that there are some good things to do while the engine is apart: porting, 3-window bearing, ectera. RX8 eccentric shaft... That's personal preference I presume and I'll leave that input up to the more experienced members on the forum.
Also when considering your engine, what are your end goals with it? Do you want reliable power? Do you want all out fast from it? Are you going to convert it to a 6-port turbo? These are questions that should point you in the right direction with the project and give you a rough understanding of what to expect. What I'm always scared of is that if I do not have my suspension dialed in how am I supposed to control my car in a tough situation? Adding more power to no suspension increases is a dangerous mix to say the least.
Just my two cents though.
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