Just a couple things from a coaching perspective.
Lighter is better. Always. Always, and forever. There are heaps of muscles in your shoulders and back that almost no one ever uses. The best way to develop them is to shoot. The best way to ruin them is to shoot too heavy. Rotator cuffs just don't heal. they almost never get back to 100%.
One technique does not fit all, and a good coach will not teach you how to shoot like him, he will teach you how to shoot well as you. everyone is a bit different, and so there are a huge number of subtle changes you can make to fit your body.
Don't spend money on a bow until you know how to shoot. I knew how to shoot pretty well when I bought my bow, and it still took three draw length adjustments to get it to fit. That would not have been possible with other bows, and would not have mattered as much with a recurve or stick. Contrast that to a buddy who was quite good, and was sold a bow that barely fit at all (he maxes the draw, and cannot anchor back as far as he would like) Point is, if you are buying, you should be able to test drive it first.
And if you are still learning how to shoot, then its tougher to test drive it. kinda like doing your drivers test in dealership demonstrator.
Crossbows are not more powerful than regular bows. the limbs are heavier to make up for the shorter leverage. They also allow you to draw more than you otherwise would. But saying that crossbows are more powerful than other bows is not entirely correct.
As for proshops, if you are being sold to, find another shop. Some will just go for the sale. Some want you to come back. Generally speaking the little single operator guys will look after you. also be honest with them as far as your needs. Very often they can point you in a better direction if they know how likely you are to upgrade, or what sort of budget you are on. the last thing a good owner wants to do is sell you something that isn't going to work, or that won't grow with your skills.