First off, those are file sizes, not resolutions. Are these TIFs? Compressed on Uncompressed? Makes a difference....
Now I'm prolly gonna get slammed for this, but it's from someone who's been working with digital files for over 5 yrs now. This is kinda like asking which camera format will produce an acceptable 8x10....35mm, 645, 6x7, 4x5, etc. It's in the eye of the beholder.
Based upon a 300 dpi magic figure, many digital cameras can barely produce an acceptable 8x10, let alone 11x14s. Yet I have seen incredible 11x14s from 3mp cams, at well under 200 dpi.
I did an experiment just a coupla weeks ago, after reading about a guy using the same cam I do. My Fuji's RAW file outputs to 12mp, 6mp, 3mp and 1.5mp file sizes. So that's exactly what I did....burned them to a CD, and I printed each one on a Fuji Frontier @ 8x10. And you know what? Not I nor any person I showed them to could tell them apart, including 3 pro labs! The Frontier is optimized for 200 dpi, and it's by far the most popular digital photo printer in use in the US.
In the end, ask the lab what they recommend for acceptable 8x10 quality. I'll bet it's near 200 dpi, and I'll also bet you'll be delighted.
Just my 2˘ worth....