The SRT-4 handles like piss, even dangerously at times -- especially at any sort of speed. They have the power, i'll give them that and it's nice. But remember, you're used to driving that rx7...bad handling is only going to amplify in your eyes since youre used to being 2 inches off the road with an awesome suspension.
With those mods you mentioned (TBE, SMIC, CAI, Unichip, and maybe manifold) you're looking at ~210hp/220tq at the wheels or more. If you boost 10 psi (which is totally safe at that level) i would say you're at ~230-240 at the wheels. Those mods will also lock the tempermental beast of the MSP away, and will only give you a very solid, consistently powerful, fun to drive, responsive handling god of asphalt. You will beat srt-4s with those mods at 10psi without difficulty.
All those mods will run you about let's see...
TBE 500, SMIC 500, cai 150, unichip 400 = 1550 plus whatever the manifold is, can't really beat that. add a few extra for gauges and plugs and what-not, but the reality is you'll have a faster, better handling, better running, better looking (imo) car for cheaper. and cheaper insurance -- more money into the FD
Also, neons are known to be poorly manufactured and have high insurance rates. MSP's interior is hot s***, and a great sound system already. I don't know why other people have problems...but my deck has never crapped out, and the sub never rattles (make sure you set the system for 8" sub and it will work proper, default setting is 12").
for me, looking at the mods, MSP wins by a long stretch and will leave the neon in the dust in every way possible.