time to tune it up

[Civicrick]

Its time to tune up my 93 civic dx thats at 120,000m. Ive always tended to buy Bosch parts when available. I read some posts talking about Walker O2 sensors then did some price comps and noticed they are noticeably cheaper. Is there any real advantage to using genuine honda parts? Any and all advice on this subject is appreciated. At 120,000, is there something above the "normal" tuneup I might want to do? I did adjust the valves recently (and it did make a big difference! Probably never been done before.), new coolant. I have bought parts online (Rockauto, A1). Know of any better ones? Thanks!
Rick