Engine Oil

What oil (brand, types etc) do you guys use on your bikes? I know what is good in 2 strokes but 4 stroke bikes I am not exactly cluey on. Looking at my bike manual (gpx250) it has quite a lot of suitable oils...what to use!!???!!
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Johnnie5 wrote:Kawasaki spec IIRC SE which is the cheapest out there
GPX.Lainie wrote:On my GPX250 and Tones FJR1300 we use Motorex, Fully Synth 15w50 or 10w 50