I agree that air pots are a great way to keep coffee piping hot for hours while preserving the taste/texture and doing so at a good price. I use BUNN air pots that have the lever on top and really like the overall build quality of these things. I recently bought some used air pots at a great price for the larger events we do. These are the Update brand and they are nice, but I don't like them as good as the BUNN air pots.
For brewing I use a BUNN VPR unit which has alot of great features without being overfeatured/overpriced. It is a pourover model, has adjustable brew temperature and brews exceptional drip FAST. Can do 3 liters in about 6 minutes and extracts alot of flavor in this short time. Is very easy to use and is awlays ready when you need it to be.
Don't forget a grinder if you plan to use fresh beans and grind yourself. Don't go through the trouble of getting a nice drip machine, air pots, etc. then use preground stale crap... For drip I use a BUNN LPG grinder as this thing not only grinds with amazing consistency, but does so rather fast.
I will tell you most people enjoy/appreciate a great cup of "fresh/hot" coffee. We sell ours for $1.75 for a 12 oz. cup and $2 for the 16 oz. cup. This includes tax. We have had a few people to question our prices, saying "I can get this much at the gas station for $1" or whatever might be the case. We simply tell them that our beans never get older than 2 weeks, we grind and brew on-site and never keep the coffee in the air pots longer than 3-4 hours. Then go on to say "if you don't like the taste it's free"... they take a sip and gladly pay. I will say some people are OK with the sludge they are used to drinking and think if they start on good, fresh coffee it might lead to the "froo froo" or "foo foo" stuff (whatever in the hell that is supposed to mean) and they will become addicted, so they can be quite hesitant on giving it a shot. Good luck!