Hı Brad,
If you are buying a property just for investment then your first criteria has to be it's Letting potential. Any of the major resorts, including Bodrum, should provide you with a steady income throughout the summer. However, there is a lot of competion and some areas are saturated with properties to let.
If you intend to live there yourself, maybe once you've retired, then obviously that will be a deciding factor in the type of property you buy. Holiday-style homes are lovely in the summer but some people don't feel they're suitable for the winter.
Really, there are so many things to consider. You'd be best to travel out to Turkey and visit the various resorts before deciding on where to buy. Even though you are only buying as an ınvestment, you may find you want to live in the house yourself so it's important you buy in a resort/area that you feel at home in.
I had been in Turkey for almost a year before I bought my place and I would advise anyone else to take their time too before buying. One other thing, property prices have shot up in the last year at an amazing rate and if they continue to rise at the same level you would be wise to buy sooner rather than later. Turkey is also changing its Property Laws in October and this may affect foreigners wanting to purchase.
You may find something about it on the ex-pats forum.
Hope it all goes well for you,
zambuca