I have been trying to get a few of my photographs printed as 8x10s. I took them to be printed locally. I picked them up, and a lot of the image had been cropped off! So, I made sure to resize them to an 8x10 in Lightroom. I finally have them all set to go, and the uploader tells me that the quality will suffer at an 8x10 size!

What am I doing wrong?? The pixels are set to 240 per inch. Any help is GREATLY appreciated! I'm getting frustrated! Thanks!
I shot these images in RAW. Trust me, they are high enough quality! At least, they were before I cropped them...