If your current snake is still small enough for a 24x24 you could get a T8 with divider and use the extra money you were going to spend for a T25 and fill the other side of the T8. If your current snake is big enough for a full T8 you could still order the other T8 with divider so you have it ready for your next purchase. Either way you go I would get rhp for the T8. If you use a divider the 40w from reptile basics should work, if you don't get the divider the 80w should work. You could also get an rhp from pro products but they cost more but either company you won't be disappointed.