I've been cruising this forum for the last couple of days and I feel enlightened enough to ask some questions now. I have roughly $2,000 dollars to spend on a portable headphone amp and a pair of IEM's. I currently use the AT MTX50's as my over the ears with no amp. They work fine for my purposes. I think I've settled on buying some custom IEM's as my SE535's were recently stolen. I think I've settled on the UE 18's or UE 11's. I've never used IEM's before and buying $1,000+ equipment without testing them kind of scares me. How do they sound compared to over the ear headphones and/or the Shure 535's. I've read some stellar reviews about UE products, so I'm no worried about the quality. Just wanted to know what to expect.
 
I've also tentatively settled on buying an RSA portable headphone amp, either the tomahawk or the sr71a. I wanted some opinions on using either of the amps for IEM's and my MTX50's(39 ohm imp.). I've read some other posts (and ray's site) that say the Tomahawk is specifically for IEM's. Is the SR71a more for pro-cans(I've read everyone uses the 600's with it) and not pro-IEM's? I'd be happy do answer questions if you ask them. But, I'm a burgeoning audiophile who is kind of new to the game and could use some help.
 
Thanks!

$1000 + equipment should move you to the Summit-Fi section of the forum.  There are also a few sub-sections within the Equipment Forums that might be helpful to you.