For stock clean: blackface, clean, kh1, super v, deluxe..... Most are good.
Dirty: depends on what you want, for stock the ultra XL, XTC, SL+ are well liked, and any of the signature are great. If you really don't want to go the modded route right away, then best to probably go for the sig modules, they're all very impressive, and each have their areas covered:
KH1 - fender clean
KH2 - 80's Marshall/Mesa
KH3 - modern Mesa/VHT
Super V - Vox clean
Mr Scary - JCM/SLO
Grail - Rectifier
1086 - very versatile high gain mod, capable of a lot of sounds, but some find it difficult to dial in.
Note: the modded mods are seriously miles better than any stocks, and in all honestly some modded ones go for waaaaaay less than they should be on here, especially compared to what your getting out of them! Well worth a look!