The files you get upon winning will include an .eps file which is the file you will want to keep to give to professionals, vendors, other designers or printers or web people who will need certain types of files, sizes, colors, etc. that they will need for their particular output. They will (or should) have software that will enable them to make necessary changes they will need for their purposes from this file. If you have Adobe Illustrator yourself, you will be able to make changes also. But otherwise this is the file to keep a clean one always available for above purposes.
You also get jpgs of the logo and although LT only has upload spaces for the eps file and jpgs (which i think they automatically gives you a few sizes of), once the files are approved you can send your direct email and I can send you png files which have a transparent back and are sometimes easier to use in some programs for placement than an eps (which also has a transparent back) of your chosen version and a grayscale, as well.
Other changes, variations on the logo (without slogan, with and without .me, etc. don't really come with the group of files you are entitled to with the prize,(you are basically entitled to the versions they discuss of one chosen design) but as noted above, you can get most vendors to do simple changes or have a designer make other variations for you as needed (locally or even through the winning designer). But a designer is not allowed to "make deals" or talk about future work until after a winner is chosen. And terms for a local designer or the winning designer is up to them at the time. None of that can be discussed however until after the contest is completed. It probably makes sense to chose the logo design that includes all of the elements that you want in the final, as that way you have approved the logo as a complete design/element. (Make sense?)
re: the 107 and 108, the lighter is a gray but on the end of where it should be fairly clear to anyone(though we could go with a darker gray yet. I'll go ahead and do the green version. Let me know if you want to see a darker grey as well as the black. Also, when you say different font, do you mean for the slogan---try a couple of different ones? Also, do you want to see what the version with the sun would look like without the slogan so you can feel comfortable with that?
hope i didn't give too much info here or confuse you. Please ask if you need something clarified more.
C