Well, it is going to be an 800mhz system was the plan. We definitely want a trunking system of some sorts. but with it being 800mhz are my options limited on what kind of trunking repeater we can out together?
Do you have licenses for those 800MHz pairs yet?
-Talk to a frequency coordinator before buying anything.
What's your reasoning behind needing trunking?
-Do you really have that many users that channel capacity is an issue?
-Or is access control a concern?
You can run any kind of trunking you want (within reason) on your frequency pairs. The concern should be getting equipment. While buying up lots of used 800MHz SmartNet equipment might seem attractive, you're buying into 1980's technology that is no longer supported by the manufacturer. You'll be limited to Motorola or EF Johnson radios.
I shut down my 800MHz SmartNet system back in 2013 or so, and most of it went to the e-waste recyclers. The repeaters were junk. The controller had so many leaky capacitors that there was no way it was going to work again. The old MTS-2000's were selling for about $20 on e-Bay, so we didn't even try to sell them. It wasn't worth our time or effort for $20 each. Most of the mobiles were in halfway decent shape because the old Spectras had been replaced under the rebanding project.
You also have to be careful of the older radios you'd buy used. Not all of them have been rebanded, so you could easily run into issues there unless you were 100% confident that what you were buying had been rebanded.
There are better options.
-DMR, as suggested, can run two talk paths on one repeater. There is access control. For 800MHz, you are going to be limited to Motorola gear, but be aware that can get expensive. Be careful about getting locked into a brand. Dispatchers can link into the repeater via the data network, so they could be running off a PC. Automatic Vehicle Location and data communications are all options. Repeater linking over IP to increase coverage.
-NXDN will do one talk path on a repeater. There is access control. Tends to be cheaper than DMR. On 800MHz, you'll get locked in to Kenwood. PC based dispatch consoles are cheap and don't require a radio if you have a network connection to your site. Automatic Vehicle Location, data transmission, etc. are options with this. Repeater linking over IP is an option to increase coverage.
-LTR opens things up a little bit more. Would be cheaper. Older technology but still used. Can still do AVL and data communications.
Avoiding the brand specific systems can keep pricing down. LTR to DMR (not MotoTrbo) might be a better way to go. You can still buy used equipment as well as get new stuff.
Also, while I understand the desire to save money and do it yourself, you should at least compare prices with a radio shop that will sell you air time on their system. Often they have linked repeaters and the coverage you'd get would be much bigger than a single site of your own. You would pay for air time and/or by subscriber, but not having to build your own system, lease tower space, licensing, frequency coordination, etc. can really make it an attractive option.