i tend to agree that auto ludes aren't good for a number of reasons, but that kinda dogma's coming from a neon light guy.
but yeah i wouldn't spend TOO much money on your lude, just b/c it seems kind of like a dead end. Maybe basic bolt ons and a suspension, but anything beyond that could get you behind the wheel of something potentially quicker, like say for instance a s13 sr20det. maybe even a s14.
my above $3500 number is on the low side for an FI install, but would get you started. I think a more realistic # for turbo is around 5000 to 6000.