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Joe_G.I did the same, crossed over a PSA Old Judge Ned Hanlon to an SGC holder but had to accept a one grade drop. I was OK with this as I agreed with the grade and want all my Detroit material in SGC holders. I have some other non-Detroit PSA holdered cards that I know would suffer the same fate if I cross over to SGC (drop a grade).
On the flip side, I had my recent Dan Brouthers card upgraded from an SGC40 to 50. This was the card that received some attention on this forum when it hit eBay. It looks like a PSA7 / SGC80 until you notice the small indentations left on the flip side from an old autograph that had been erased.
I continue to prefer SGC over the others by a fair margin. They may be harsh on grading but fairly consistent, easy to deal with, and as already stated have a nice looking holder that does the job.