Any of the major brands would have a primary reg + octo combo that would meet your needs.
Typically, dive shops choose their rental regs to be good performers with low maintenance costs that are easy to service. That can be a nice hint in figuring out which regs hold up well over time.
The Aqualung Titan is a robust, middle-of-the-line reg that is straightforward to service and very reliable.
For warm water diving, Scubapro offers the MK2 first stage (not environmentally sealed) which is a solid performer. The MK2 is a time-tested, piston design that is super-easy to service.
If you'll be diving in cold water, you should probably consider getting a sealed first stage. FYI, most reg manufacturers offer an environmentally-sealed first stage.
In selecting a reg, you should really consider getting a brand that a nearby dive shop can service and tune. Reg performance has a great deal to do with the skill of the reg tech who last serviced it.
Have you used any particular reg brands/models that you liked?