Lukaleo:
Stay focused on your original two choices... or you'd be opening up a can of worm that's gonna devour your wallet whole.
Don't mean to come down on the PFEs and VSonics, they have good values. But the OP had the IE7s and TF10s in mind, and that's what he should stay focused on. Otherwise, pretty soon there'd be half a dozen budget friendly IEM suggestions as there are A TON of them out there, and they all have their own appeals. Then the OP would just be better off reading through the multi-IEM reviews to check all of them out. It's all very confusing and overwhelming. So, stick with the initial two!
You should know that paying over $150 for TF10s is paying wayyyy too much. They are not worth that much, considering their comfort (not bad but affected by large size) and just general performance. But, for them having the hardwares (triple drivers and a replaceable cable), I'd give them a worth of $150 tops. (Esp. since they were on sale for under $100 brand new from amazon this past Christmas)
Now addressing some of your concerns:
- Both IE7s and TF10s are durable. The IE7s much more so. However the TF10s make up for it with replaceable (and upgradeable!) cable.
- Yes the IE7s have better cable. Softer, more flexible. But in terms of microphonics these two are about the same, especially since you'll want to wear both of them over-the-ear and upside down.
- Neither of these have strong mids. I mean, the mids are probably good on their own, but in terms of the whole presentation, mids are somewhat overwhelmed by other attributes.
- The IE7s have somewhat of a darker bass. There's a good quantity and quality of bass. But it feels dark. There's no better way to describe it so if you don't know what exactly "dark" means then you'll just have to hear them.
- As others have said, the IE7s have a more relaxed sound.
- The TF10s sound has much more coloration and sound more lively. Due to the highs and quickness of BA drivers, they sound brighter.
aleki puts it very well. But really, in the end it comes down to personal sound preferences. And until you have heard both of them yourself, you won't know for sure which one is better for you. Or maybe you'd want both, because, and I quote aleki, "they each have something different they bring to the table."
Good luck!