Turbines are a good choice, I'd stay away from the beats tour simply because the beats by dre is more oriented to looks than actual performance. Having said that, I've never owned the tours, but from my experience with the studios, I felt that it didn't sound that great for the price i paid. Don't get me wrong, they dont sound bad, but for the price, there are better options
Anyhow, I bought a pair of Turbines used for around 90 bucks, and those are a great set of earbuds. The only gripe I had was that when I walked and the cables slapped against my shirt I can hear a dull thudding noise in the IEM which got annoying really quick.
Currently, I'm using a pair of SE530's from Shure, they retail in the higher range of IEM's though nothing as close as what a pair of JH13's would run you, they are still a great set of headphones. Lots of bass for when I'm listening to thumping hip hop. Crystal clear high's, and the midrange sounds incredible!
Also, I'd also recommend the ATH ES7's great set of headphones for a very very very fair price. Grados are good as well, particularly the SR60s but because of their open design, they leak a lot of sound and let in a lot of sound as well. Given you're listening to it through your iphone I don't think you'd be stationary while listening to it so I might not recommend the SR60's but if you're inclined to give them an audition it's a great "benchmark" for the performance you want from your headphones.
Ultimate Ears SuperFi5 or whatever iphone compatible version (with the mic) are a great choice as well. Heck even the ADDIEMs are great (apple dual driver IEMs) (though from the time that I owned them, I felt they had the same problem the Monster turbines had).
In the end it all comes down to what you want to pay for headphones and what you consider to sound "great". All of this is very subjective, and what I may think sounds great may sound like trash to you. Definitely buy from a place that let's you do exchanges and returns because though a pair of headphones may sound great, there may be some design issues (thudding cable), fit issues (doesn't stay in your ear, keeps popping out, uncomfortable) and price issues that may deter you from keeping them.
gluck!