It sounds like you're doing everything right. And if you're NOT experiencing any problems, my overall advice is don't change a thing.
I don't think you'll see any difference measuring your Eizo monitor between an i1Pro (Rev1) and an i1Pro2. Nothing essential has changed with emissive mode. There's no justification to change devices because of monitor viewing.
On the other hand, if you feel there is some compromise with gamut of your printer (reduced), you may benefit a little bit from measuring without a UV filter. Your current i1Pro with UV filter could be filtering out some of the dynamic range. I seem to recall that Epson Premium Glossy Photo has low UV content, so you really shouldn't need a UV filtered measurement with this media. Conversely, the i1Pro2 has both UV included and excluded capability. But unless this is noticeable, I wouldn't make a move for only a 1-5% improvement.
If your i1Pro device is older than ~4-5 years (or so)... then you can make a case for replacement. At that point you should have already sent the i1Pro into X-Rite for recalibration and recertification. Minimally thats about ~$250 plus shipping. Its hard to say what your current i1Pro will fetch on eBay or craigslist, but rarely does anyone get more that $600-700 'with' software, or $250-$400 hardware only. Until June 30, 2013 you can get an i1Basic Pro2 for around $950 net with rebates applied. So, you do that math.
Finally, don't forget that that your i1XTreme i1Match software license is tied to the dongle inside of your i1Pro and likely you will need to replace that component too.
Hope this helps.