I'm thinking about changing my lenses, I'd appreciate any advice.

The big question would I get better IQ with the 2 kit zooms
18-55 AFS DX VR 3.5-5.6 $170 USD
+
70-300 AF 4-5.6 $120 USD

than I get with my 18-200 AFS DX VR 3.5-5.6
I find beyond 100mm I'm disappointed with this lens.

I figure I could sell my 18-200 and buy the 2 zooms so I can still cover a range and pick up a 28 F2.8 or 35 F2 without too much cash changing hands.