Hi:
First let me say that I’m very happy I found this site, I prefer the way the reviews are written a lot more than at dpreview.
OK, I can get the:
Canon Digital Rebel XTi 10.1MP Digital SLR Camera with EF-S 18-55mm f/3.5-5.6 Lens: $647.68
Canon 430EX Speedlite Flash: $234
TOTAL: 881.68
OR
Canon Digital Rebel XTi 10.1MP Digital SLR Camera (Body Only): $578.88
Canon EF-S 17-85mm f/4-5.6 Image Stabilized USM SLR Lens: $478.49
Canon 430EX Speedlite Flash: $234
TOTAL: $1291.37
Do you think it's worth the extra $409.69 for the different lens?
I will mainly use this camera for family photos, in the park and to photograph our new baby due in January. I’m not a pro, just an amateur printing mostly 4x6 and an occasional 8x10. I also don’t look at my photos at 100% on the computer screen and analyze each pixel.
My crazy justification is that I have the money now, in 6-12 months with all the baby expenses I may not be so willing to part with the money...haha

!! Also, I like the fact that the better lens has the image stabilizer that would allow me to shoot without a flash in some instances.
Please let me know what you think.
Thanks!
Mitch