As you can see, more and more people are making class d amplifiers...or about to make class d amplifiers. Unless you plan to hold on to it forever...or don't care about massive depreciation when you resell, I'd suggest you buy one that is well reviewed (much easier to resell) and which you don't see being offered for resale very often (meaning people tend to like them and hold on to them).
As for a 30 day trial period for a product shipped to Mexico....maybe it won't be possible....meaning it is even more important to buy a product with a good reputation that will be easy to resell if and when the time comes.
Good Luck