Hi well I have owned (282) and currently the 252 with various PSUs. To me the element that seems to drastically change the sonic character is whether the PSUs for the NAC are DR'd or not. To me the HiCap non DR and to some extent the SC non DR exhibit a slight mid bass hump/warmth, that goes when you use a HiCapDR and SCDR. I found not a huge difference between the HiCapDR and SCDR on the 282, and the SCDR seems to transform the 252 from sounding reserved and subtle into a forthright, balanced and mightily insightful pre.
So if you plan to get the 252, and you like a more forthright, insightful and agile presentation then get your SuperCap DR'd.
BTW my CDX2 native sounds amazing into 252DR/250.2.. In fact it never sounded better..
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Allante93!
PS. The Dreaded Loom