I guess it depends on your long term view...like some have said here already.
Even with that view...your BIG cost is the 3.6 conversion.
Maybe an "in between" solution?...keep your car and do all the other upgrades except the 3.6. To gain another viewpoint, do a search here for "Tyson" and "140 hp"....and you'll quickly see the alternate viewpoint I'm talking about ( hint.... to go fast on the track...hp is about 5th down on the "list").
--Wil Ferch
( PS- just me..."Mr tightwad" looking for alternatives !
)