buy the less expensive bow from the shop and use their range. Just from being in there and with other people you can learn "tricks of the trade" about bow shooting form much faster. One year later trade that bow in for the more expensive model. You will know how to shoot and will know if you really want to spend that kind of money.

I bought my current bow 3 years ago for 200 bucks added sights rest and quiver. for a total of the 350 range, and this bow is still going strong. I really don't plan on getting a 500 bow anytime soon.