Depending if you run on EM or not.
Agi twins remain the cheapest twins to buy (you can buy 4 of them for little as 150-200RPS - which nets you almost a guaranteed full set hart+keena... although I needed 8 attempts on my Earths, but w.e.)
RPs doesn't appear to be the problem for OP as he can waste it on useless SES's and ASES's. I'd rather waste it on permanent stuff, but that's just me.
Anyway, 300 AGI at that lvl is a little above OP, not mentioning a 1500% AGI crit boost (or 2000% for the matter). It also nets you enough evasion for that level mobs. In the meantime, Earth twins can be saved for.
Your only issue would be enough crit %.