My advice would be to go and handle them all, checking for weight, length etc. and if possible shoot them. Some shops will let you, while others will not. What suits one, may not suit another. Some crossbows, one is limited to the manufactures type of arrows (size, nock design etc.) which can be very costly. Some crossbows require a special press.
If you have a lot of use for a press, purchase a good quality one that one can tune vertical bows, set the vertical in a shooting position to shoot it remotely when tuning. Some of these presses can be closed down to 6 1/2" and may just require different fingers. The more use one gets out of a press, the cheaper it costs. Some presses have string adapters where one can build your own bowstring or reserve it.
Check to see how close a repair shop is unless you are cape able of doing your own work. Warranty may play an important roll, but remember warranty is not free as this is why some of these crossbows are so expensive. You are paying for that warranty in the cost of the crossbow whether you end up using it or not.
All the best.