I'm another one of those Hesperians. Cleghorn is a fun trail with only 3 pretty difficult spots that come to mind, depending on which direction you run it though. Very close is the Pinnacles trail, really fun with super steep hill climbs, doable without a locker or lift.
I run a stock 55 with 33's and all the trails in the San Berdoo mountains are doable and still fun. I often run with a friend in a stock wrangler with 31" tires and no lockers, and we get him home everytime. John Bull is a fun one, as is dishpan springs. However, dishpan has one spot that is pretty tough without a locker.
Holcolmb creek is the most scenic trail in that area and is completly doable in a stocker. Last summer some guy made it through in a stock f250. There are some good trails out near Pioneer Town also.
Most of the well-known Johnson Valley and Stoddard Valley stuff is too tough for a stock vehicle, but Achey-Breaky is doable with the bypasses (no bypasses necessary if you like dents).
Final note, Honda Valley, in Hesperia. This area is private property, but you can drive a street legal vehicle out there without any worries. There are not any established 4x4 specific routes, so find your own throught he maze of trails. There is one very tough future trail out there that has remained hidden for some reason. And finally, driving around the river bottom is fun. Just don't go into Deep Creek on the weekends unless you want a police encounter, it is permenantly closed. Hit me up if you want to join us for a local run one day.