Seeing as you don't already have CS, Hell Kerbecs and Ray Unicorno are the best to make a top tier (Hell Kerbecs BD145CS/WD) right now. After that, get basalt, and then byxis. Also, try to get an MF-H. If you could stretch to three, I'd say Basalt, Byxis OR Kerbecs and Unicorno (for MF-H Basalt Aquario 230/BD145CS), but yeah.
By the way, make sure you get the Booster version of ray unicorno, the CS in it is a non-aggressive one, thus better defensively and stamina-wise.
By the way, make sure you get the Booster version of ray unicorno, the CS in it is a non-aggressive one, thus better defensively and stamina-wise.