I am so sorry it took me this long to reply, last week an impending sale of
company suddenly went through and I was without a computer... I finally got
my new one hooked up and I have 354 emails!!!! I hope people have answered
your questions already...

In any case at level 26 I'd stay in Lake of Ill Omen. You can solo there
(especially around the skeleton in the south) or get a group for the sarnak
fort or goblin mine. There are so many nice spawns there. If you get bored
there go to Warsilk Wood and fight the forest giants.

At 28 or so head towards frontier mts for the mountain giants. You wont
believe how much money you make. Another option around 28-30 are the
driders in Firona Vie.

If you can a dungeon capable group anytime after 25, Dalinar's is the place
to be. Just know that corpse retrival is horrendus as there are basically
no safe spots and the only exits (after level 1) are teleporters...
Weee!!!!