As long as you've spent the money on proper lighting, skimming, water circulation and books, then go for it, but IMO all of those are much more important to have before a reactor.
Yeah I'm good in all those areas. I just need some recomendations on the different reactors. I not looking to break my wallet here so lets keep the recomendations to under 500
IMO, you may want to wait out on the reactor yet. Test your CA level now. Chances are reactor are not needed 5 months down the road unless you are getting into calcium hungry clam, sps or LPSs. Even if you are into those, regular water changes usually supplies adequate CA for you.
Personally, I liked Kalkwasser reactor more than Ca reactor. It's for slightly different application, but it is enough for me coupled with regular water change.
I got tired of adding B-ionic every day! I figured that I would have a reef tank for a long time, so it was a good investment. I bought a K2R reactor and except for a few minor issues, it works great. My calcium is steady at about 420ppm and my ph is very stable. It did cost more than $500 though.