I have bought several of these things so I can give a little advice.
First off is, you do tend to get what you pay for. All of the ones you see out there for hiking and such nowadays don’t tend to have great reception, and clarity always seems to be an issue even when you aren’t that far from each other. Part of that can be resolved by speaking more slowly and clearly and keeping the mic at the correct distance from your mouth.
Another thing to be aware of (which burned me when I bought mine) is that the ones that advertise 7 mile ranges are likely using GMRS to do that. GMRS requires a license from the FCC which IIRC costs something like $80 for each unit. I imagine its unlikely an FCC swat team will descend on your house and drag you away to Federal PMITA prison, but who knows?
So, if these are for business use, I wouldn’t recommend the combo packages you see at REI or Circuit City or wherever. My wife and I use ours for communicating during caravans or if we split up during Geocache hunting, and they are okay for that purpose, but i wouldn’t call them ‘great’.
As for the real nice ones, you are probably looking at several hundred dollars and I can’t answer questions on those unfortunately. I have no idea what Squelch does or what colors are fasionable for it this summer.
One last thing to keep in mind is, if I understand correctly, systems you see used by the Fire Department, etc, are augmented by the use of a tower and repeater. You can’t expect to have the range and clarity those systems give unless you can erect your own tower and repeater to rebroadcast signals. I understand you just need a mile or so inside, but I’m just throwing it out there.