I would have to agree with John in TN, that the higher end models outlive the cheaper ones. I have been in the Power Tool business for 66 years and I cannot tell you the number of times that contractors have said they get 2-3 years longer life out of a higher end models. The accuracy of a better built saw will stay longer.
The issue we have with Rigid is the part replacement. It takes about 6 weeks to receive a part if you need it. Customers do no want to wait that long, simply because they cannot afford the down time.
I would recommend a Brand name such as Makita, Festool, Bosch, DeWalt, or Delta. Each of these Power Tool Companies have been in business for a long time, with factory reps in each town, authorized parts and service centers in every town, which results in more accessiblilty and customer service.
The price varies for each Brand and there are so many options for a 10" or 12". Sliding, laser, dual compound, or single compound, etc.
I would recommend for the price a Makita 10" LS1040
for $249.00 This is a single compound miter.
Mike O www.toolsandmachinery.com