Honestly, look into coil overs. The ride is better and the handling is better. I had urethane bushings in my LCAs. They wore out enough that the passenger side dissentigrated. The LCA would move in it's socket depending on the road conditions. Talk about scary. Either stick with the...
Personally, I would do the cams. I did the FR500 cams and intake when I had my heads ported, it really woke the car up. It was a lot of fun. Now I have cams in the 230 @ 50 range with a Sullivan. More fun on the rack, not as much fun daily. I'm too lazy to look up the specs for the FR500...
Just to add some confusion for ya. My Flex started doing that. We thought it was all the things listed above. Turns out spiders had taken up homes inside the vent pipes and clogged it. The scene from blowing out the pipe with compressed air looked like a horror movie. Tons of those little...
Best thing to do is decide how far you are going to take the car and if that requires a custom tune. If so, then try to decide who is going to tune it for you and find out what they use. That way you won't end up buying two units. It really doesn't matter what brand it is.