Hey Jason,
Before buying new equipment like this I'd suggest working with someone else for a couple of days to see how they do things. You might be able to save yourself quite a bit of money. If your interested in high volume machines that's what we use.
10gpm
12 gpm and one 8gpm I'm in the process of converting over to a 10gpm machine. We also have a cold water 7gpm machine and a bunch of smaller 4gpm pull around units.