Hi Nvp,
Some further thoughts..
After having trialled for couple more days :
*Without Pre ~ The direct/rawness of detail/transparency/resolution and more upfront presentation as always seem impressive and fun to listen to initially, but sure enough signs of fatigue sets in given longer periods.
*With Pre ~ Soundstage sounded more expansive with better dimensionality, presented in a far more relaxed and enjoyable/addicting manner, no fatigue here. *Overall better dynamics and PRAT too, closer to that of live performances.
*However I'm here using same source for comparisons, where else in your case, a supposedly superior one substituting the Pre set-up, so results will invariably differ.
Do weigh into your consideration also that perhaps buying an excellent Pre is after-all the much wiser investment (longer term one) compared to buying a SOTA Cdp? *Either way, just make sure the 800/801 combo you are considering are priced right, one which can be re-sold later at little/no loss to you. ;)
Btw. Do you use HS-link (RJ/E) as interface into your DG? If yes, do try one of the upgraded cables I mentioned above. A worthwhile upgrade for not much money, imo.