1st time bike owner and you started on a 1k, huh? Don't be surprised if no one replies to you here...
If it's a new bike don't use synthetic. It will still be wearing in. Synthetic would be a waste of money because you'll be changing it right away, and I've heard that regular oil helps the break-in somehow, but I have no knowledge to back that up.
Being that it's an '05 though, I doubt it's new... I usually just use the Suzi brand; works just fine for me...
Oh hey, here's a tip: SEARCH!