PS Audio Perfect Wave DAC upgrade to DSD?


PS Audio DAC users - I currently have a Perfect Wave DAC with Bridge II, and it seems to me that the next best upgrade to my system is to convert it to a DSD.  I am a neophyte audiophile on a budget, this purchase will be the only major upgrade affordable in the next 6-12 months, what can I expect in terms of SQ improvement?  

Rest of system is viewable on audiogon systems; the short version is Thiel CS 2.3s, BAT VK-55, decent power supply cables interconnects etc.  Weakest part of the sound to my ears is the high frequencies, sibilance and smear in particular.  Responses in prior posts have pointed out the speakers as a weak link, and that is another potential/next upgrade.  Room is fairly well treated but still being optimized.
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I bought the upgrade kit for my PWDII, and have been very, very happy to live with a DS Sr for a year now.  I liked the sound of the PWD a lot, but the DS betters it in every way.
My .02 would be to address the speakers before upgrading the DAC. Assuming your speakers really are the weak link (you said they are, so I’ll accept that), you will get much more bang for your buck by upgrading those or investing in room treatments.  However, if your heart is set on the DAC upgrade, the DSD is amazing and a worthy upgrade. You won’t be disappointed. Cheers.