Which oil at low miles

[Tortuga_imp]

Ok, I know I'm going to get shot for this (starting another dreaded oil thread) but I'm confused as to what I should use for my impending second service at 400 miles (lol).

I'm sure the dealer either didn't do a service at 100 or if they did just chucked some bulk tank crap in.

I saw various 10-30W motorcycle specific oils on eBay, however some are fully synth and others part. I'm under the impression fully synth is for higher mileage bikes, so I need part synth, but.....

Would I be ok to use Castrol or Rock Oil semi synth 10-30W motorcycle oil or will my head explode if I don't use Honda branded oil, which seems to be rare on my Island.