The Ho oiler is nice for running 28" and up in real hard dry woods. The clutch cover and spikes from stihl will probably cost you more than the R upgrade would have and that's not counting the oiler, roller chain catcher, and the wrap handle.
The ES light bars come in 28", 32", and 36" in both .050" and .063".
The ES light bars come in 28", 32", and 36" in both .050" and .063".