How did I miss this! I've been crazy busy since about the announcement (promotion at work) so I guess that explains it.
I am SO GLAD that I opted for the Sigma 18-200mm VR late last year. I was deliberating between that lens, the Sigma 30mm f1.4 and the Nikon 50mm f1.4 at the time, but this lens is exactly what I wanted the Sigma and Nikon primes to be - cheap, fast, and a standard focal length.
This is SO coming home with me as soon as I pay off my new Hackintosh (Dell mini 9). Between the 18-200mm and this last prime I think I will be very lens satisfied for awhile (although I am going to hold my breath for a cheap ~50mm f/1.8 AF-S lens for portrait work, or just get a "real" nifty-fifty when I upgrade to D90 or something).
(Off-topic) FWIW, the Sigma 18-200mm VR is a fantastic all around lens. The image quality/color reproduction is, imo, a little better than the Nikon 18-55mm kit lens, the VR works great, it's HUGE but tolerable to lug around if you have a camera strap, the zoom and focus are very smooth, speaking of focus the AF is fast and accurate except when you get past about 65mm in very low light (the AF light on the D40 is blocked a little by the hugeness that is this lens), and it's just all around very impressive. I would say that if you have a D40 or D60 this is a lens to build around - get it to cover "everything" while you piece together all the specialty glass you need.