Doesn't matter if you don't have the latest - if the next refresh looks cosmetically identical (and most likely, it will be) you have nothing to worry about. You may not be on the cutting edge of technology - but THEY don't have to know that 😉
Seriously though, I think you need to reconsider your priorities. Going out of your way (spending thousands of dollars) with the hope of impressing some girls is kind of extreme. But if you have disposable cash lying around, by all means, go for it. It's your money - or your parents'; whatever.