I certainly would recommend Buff Orps. They're a great breed.
I personally love Cackle Hatchery's BOs. I've worked with Privett's, Ideal's, and a few others, but none have surpassed the excellence of Cackle's. They were bigger, fluffier, friendlier, and of an overall noticeably higher quality than any of the others I've worked with.
The Buff Orps will differ from the RIRs in several ways. Personality will be the main one. While RIRs can have aggression issues towards other birds, Buff Orps tend to be very docile and friendly with both flockmates and humans. They may lay fewer eggs - they will still be average producers like RIRs, but I would expect maybe 20-40 eggs less per bird year from them, depending on the individual. I've typically gotten 4-5 eggs a week per bird from my Orps. They will be bigger and fluffier and so may be a bit less heat resistant than RIRs.