IROC DAC or PS Audio Ultra DAC / Digital lens

I am exploring DAC's for My Mini Mac computer based music server the PS Audio Ultra DAC / Digital Lens and Larry Moore and his IROC . These are the two products that look most interesting to Me as of now . I was wondering if any people who went to RMAF had a chance to hear both of them and any thoughts.I did have a chance to hear the IROC once at a Cincinnati audio club meeting but this was before I set up My own music server. I would be using either optical [ Toslink } or USB out of the Mini Mac I just copy CD'S to My hard drive in AIFF and have no Hi Res downloads just looking for very good sound.I may in the future want the ability to do Hi Res files 24/96 but that is down the road a little bit I am still learning all this upsampling /oversampling /24/96 / 24/192 ect. just trying to figure it all out. I now use a older Cal alpha DAC with 24/96 upgrade and a Toslink cable sounds good but know there are better DAC'S out there. Thanks for any thoughts Marc