The Vortex Vanquish sounds like a great binocular but it won't fit on your pocket. Take a look at the Pentax DCF MCII 8x25.
http://www.eagleoptics.com/index.asp?pid=4170
I used to have an 8x22 version of these and they are excellent optically. Lots of eye relief too. Their only drawback is a rather narrow field of view. But there is no better binocular this small that has such good optics for the price.
You really need these kind of dual-hinged binos to be compact enough to put in a shirt pocket. I recently ordered this binocular, and will post a mini-review after I receive it. One member here -- Lucznik -- really likes this bino as well. I want something I can take backpacking, and carry with me everywhere, and that doesn't look conspicuous in urban settings.
Eagle Optics doesn't say it, but the Pentax website says these binos are phase-coated.
Yes indeed, I still have both my 8x22 DCF MC and my 8x25 DCF MC II. I paid $100 for the former and $120 for the later. The 25mm unit continues to be my everyday, everywhere companion and has accompanied me on numerous trips where anything larger would have been simply out of the question. I still believe that at some point I will upgrade to something "high end" from Nikon, Leica, or Zeiss but until then, this really has proven to be a wonderful little binocular. I have enjoyed enhanced views of birds, wildlife, sporting events, theater, and other opportunities because I had them with me.
My only "complaint" is that I'm not so enamored with the thick rubber armoring that has become so popular. It adds bulk to the binocular that I think is not necessary. Rubber armoring is great on full size binoculars that get banged around a lot but, the order of the day for compacts is
small size. A simple leather covering (like what can be had on the Ultravid) or perhaps a really thin rubber (like on the older Zeiss ClassiC compacts) is a far better choice.
If you want your binocular to be truly waterproof (as opposed to just weather resistant) and are willing to pay just a few dollars more, you're in luck because this year Pentax has once again upgraded their little DCF compact. The new version is called the DCF SW and sells for $150. Here's a link:
http://www.eagleoptics.com/index.asp?pid=5181
On another topic; It is true what people say that reverse porros will be optically superior to comparable roof prism units (even phase corrected ones) but, the difference is small and you really pay for it in added bulk and weight. I had a Bushnell Legend 10x26 which was wonderful to look through but, it was so big that I never really took it anywhere so; I sold it.
It seems to me that the whole point of these little compact binoculars is their ability to be with you all day, everyday, no matter the circumstances or environment. Of course you trade off some optical performance for the small size but, the alternative is to not have any optic with you when chance or fate send you unexpected opportunities. If the binocular can't be carried comfortably and unobtrusively in a trouser pocket, then it really is failing at its basic purpose.