So I am not pro, but I have had my used 99' Skeeter SS 90 16'2" with a Yamaha for a couple of decades now. Here are some of my opinions. First, boat prices are crazy right now. I don't know if or when it will change to be honest. I think we are seeing a shift in how marina's etc keep inventory and it seems like we are going to see fewer and fewer new models on the "lot" - which also means we are going to see fewer end of year / last model year discounts. It also means used boats are going to continue to come at a premium. AKA - we are going to pay more now and have more trouble finding a "good deal" now than we have in a long time. I feel your pain as I am looking to upgrade myself.
Used: You have to be so careful. I got lucky and bought mine from a friend who was meticulous with the boat and got a screaming deal. That is a great option, and one of the few ways I really consider a used boat that isn't from a dealer you absolutely whole heartedly trust. If you go that route, spend the money to have a mechanic check out the boat. Something to consider with buying used, if you don't have the cash in hand to pay for it outright and need to finance - your loan terms will not be as good. Higher interest rates and shorter maximum length usually. May not matter in your case, but it is something to consider.
I will say that I absolutely love my little boat - if it is me fishing or me +1 angler. For two people, it's fine. It runs about 40-45 depending on the prop and load I have on it. It's small so it runs a bit rough, and in "big" water you are in for a ride. That said, I quickly learned that it is too small for fishing 3 comfortably. 18' for me is the minimum size I would want if I thought I would ever have more than 2. The 90 Yamaha has been fantastic. Only issues I have had is needing to replace the impeller, which is scary the first time you do it, but not a big deal once you have done it; and the electronic choke (which I think is in my switch to be honest). Rock solid and would put this same motor on another boat in an instant. I am actually thinking of keeping this rig after I get a new boat and doing a pontoon rebuild later and use this motor for that, but that's a different topic.
If you can ride along or otherwise run other boats - that's, IMO, the best bet for finding what you like. But if you cannot - I would look for something that firstly fit's in your garage. Folding tongue will help, but measure your floor with the doors closed to make 100% sure of exactly how much room you have - it would suck to end up with 6 inches too much boat. Honestly though, with your budget at 15k, I'm really worried that you are going to struggle to find what you are looking for, unless you know someone looking to unload a used boat. Tracker aluminum is probably going to be your best bet new, like GM4511 said - and what I would suggest - but finding a new boat rigged for 15K is going to be a challenge I'm afraid. Good luck!