Ok, everybody, thanks for all your help!
I pulled the trigger in a new Sony DVP-NS9100ES.
I spoke with Matt Anker at SACDmods.com and had a very informative conversation with him. I've spoken with him before and I think he's very straightforward and honest.
His opinion is that the DVP-NS9100ES actually sounds better than the scd 555es after mods. He had a number of technical reasons and I pretty much understood where he was coming from. If you look at his system (pics at his site) that he uses to test his finished product, you'd have to trust his ears, for sure.
He also feels that the 9100 sounds better than the 555 w/o mods. A good thing as I was going to drop ship the player to him at school, but he's finishing up now and will be home in Cambridge after June 1st or so. I'll get a chance to break it in and give a listen to it pre mods. Hopefully, I won't get the urge to buy some other piece of gear in the meantime. Curse you headfi.

Here is the odd part of the conversation. He equated the XE777ES sound with that of the 555! Wow! That took me by surprise, but I didn't really have time to press him on it, but he felt the sound is very similar to the 555 similar parts in key areas etc. Also a modded 777 might be better than the 9100, but I can't do it and after a bit of conversation with local techs, no one wanted to try, at least no one I felt I could trust.
The Rega I eliminated as it seems to have had a fair amount of software issues (all fixed now according to the distributor). There's also quite a few of them on audiogon at the moment. Not a good sign IMO. Besides we have a local dealer here and while his price is fair by the time I add local tax, I don't feel that I'd be getting my money's worth compared to a modded DVP-NS9100ES.
After all I'm trying to stay away from the upgrade bug and I don't think the Apollo would do it.
The Stello. This was tough. I'm considering going balanced with my Senn 650's. SACDmods can add true balanced outs for only $75. To do balanced with the Stello I'd have to go DA220. Then I'd have to get a more expensive transport to compete with the SACDmods 9100.
I also considered the Denon 3910 but it's focus appears to be video. The audio side is a bit of a stepchild. The lack of a dedicated audio power supply made me cross this one off.
Thanks again everyone.
Now the waiting begins...