I want to LR my WF Wiz/Rogue into a pure caster. I was thinking 20 con 18 int, but I'm not sure of feats. I'm not sure which path to take as far as spell focus or prestige, so I'm really looking for ideas, although I was leaning towards Archmage. Thanks!
Edit- Do WF make better AM or PM, or neither?
Edit 2- Worded the title poorly. I'm 14 atm, so TR is out.