15Wiz/2Rog human and I need to decide between enlarge, heighten, and greater spell penetration (I'm assuming to keep quicken, max, and extend although I havn't used quicken all that much-maybe trade one of these with Fred?) for my last feat. I do quite a bit of soloing but I also will be starting the shroud among other high end raids. As this is my first caster I have no experience with any of these. Which is the best and worst? Any help is appreciated. Thanks.