Cat6 is a huge waste of money and a PITA to use for security. It's great for all you other data, etc stuff but for alarm sensors (contacts, PIRs and GB's) 22/2 or 22/4 is all you need and all you will ever need. Phone cable will work but you may find 22/4 cheaper or can get it in different colors if you want. If I misinterpreted this I apologize but it sounded like Cat6 was being recommended for everything including security.
I disagree. Cat6 is only a waste of money if you think what you are installing is going to be there for the next 20 years, and technology won't advance. If you're running the wire, run something that is going to be future-proof for the foreseeable future. Or, run your 22/4, and then run Cat6 along side it so it's there. If you're running it in a new house or a house that is partially finished, this is the only chance you'll get.
I ran all Cat6. For everything. I think it's better to work with because I punched it all down on a 110 block rather than running it directly into my panel, and then cross connected the 110 block terminals to where they need to go. It's flexible, and I never have to worry about accidentally cutting too much off a wire I'm messing with. Really clean wiring also. I did not find Cat6 to be a PITA to work with at all.
A single run gives you 4 pairs. In most of my locations, I'm only using 1 or 2 pairs. But if I need to add anything, it's there. If some super awesome ethernet based sensors come out, I'm wired for it. If I need to put an RS-485 expansion module somewhere else, I'm wired for it. Cat6 was $72 for 1000 feet back in June. Now it's just over $90. I don't know what 22/4 costs, but I ran a LOT of wire for security/HA, and I used about 3000 feet of wire. $270 is a pittance compared to the amount of time you'll waste having to run more wire in the future.
Then again, if you care about code, or UL listed installation, you might not be able to use Cat6 for an alarm. But, I don't care about that, so I didn't even bother to check the regs.