Here's my full-on take (in order of personal preference):
Sony MDR-EX1000
The EX1000 is arguably one of the finest dynamic driver in-ears you can get. It has refinement, space, depth, and power, but is tuned to have slightly less-than-neutral bass punch and a more-than-neutral treble. That type of signature fits my personal tastes well. However, it doesn't isolate well for a closed setup.
Sennheiser IE80
The famous German firm doesn't really make bad products at all. Most of their products sound very pleasant to the ear. But they're rarely excellent values, either, because of firm pricing policies. The IE80 is essentially a mostly cosmetic refresh to the venerable IE8, intended to keep the dollars (or Euros/Marks, if you will) coming in until they release their new, very expensive flagship the IE800, in June. So yes, the IE80 is old tech wearing a shiny outfit --- if that gives you pause, don't consider it. Otherwise, it's a very pleasant-sounding product --- spacious and smooth, if a little bassy and lacking detail compared to the latest and greatest.
Sony XBA-4
My belief is that the XBA line is intended to leverage the production power of Sony by mass producing the little tin soldiers inside the XBA. Not wanting to bother with crossover circuits, they decided just to stack filtered drivers on top of each other. Discussed widely in other threads, many, including I, feel the XBA line has a measure of artificial disjointedness to its sound. Nevertheless, some people (people whose opinions I respect) like it, so it still has potential. It's wide and spacious, with airy but recessed vocals, and punchy bass. My personal feeling is that the price for these will come down soon enough, so it might not be the best time to get them. It's also a first generation product; I believe that even with a firm like Sony, their BAs need some more work.