I would say avoid any lenses opening to f2.8 with the D40x.. They are too big and heavy to be able to hold comfortably on the little body. I always use mine with a battery pack on the D300 which gives me something really big to hold onto.

Avoid any lenses that don’t go down to 18mm or less. You need a walk-around lens which means going from wide-angle to telephoto and a 24mm just isn’t wide enough for me.

I would recommend the 18-200VR but it’s not as sharp as the 18-55 that you already have. If your problem turns out to be camera shake then it might be better but you already have the 55-200 with VR. I find the 18-200 is sharp enough for almost everything I do. I use mine a lot.

My personal choice would be the 16-85VR. It’s compact but quite heavy. It really changes the look and feel of the D60 compared with the plastic 18-55. It feels like a quality combination. The results with the 16-85 are consistently good, edge-to-edge at all focal lengths, and it has a really useful zoom range (equivalent of a 24-127mm in 24x36 terms). Some people say it’s better than the 17-55 f2.8..

And I would get the 35mm f1.8G DX (see PJ's review) rather than a 50mm. It's only about $200, it has great performance and - again - it looks really great on the D60..