First of all, if you think I am posting this in the incorrect forum please feel free to point me elsewhere.
I am getting back into riding after a two year layoff due to back issues (fully healed and approved and tested to return). In the past I have always been a non-competitive MTN rider riding on and off road for fun and fitness. I have done several 50-80 miles rides on my current bike. My riding partner and I have put together a ride near the Mackinac Bridge from southeast Michigan. We have mapped our path at 257 miles and will allow for 4 days to complete it to limit saddle time. It is a combo of cement and gravel roads. It will be a wallet tour, staying in hotels with very light packing. I am looking at several used CX bikes as a possible choice or the trip and my new main bike (I rarely ride aggressive trails anymore) and have no plans to race officially. Am I making the right choice? My budget is around $1000. I am 5'11" 185lbs with a 31.5" inseam. I really do not want to go touring since many future rides will be back roads and maintained two tracks. Thanks in advance for any input given.