barkerpj,
Your setup and mine are alot alike (stock Sony S7700, Ack dAck! v.2, stock Clari-T, MLTL floorstanding speakers with Fostex F200A drivers). A friend here with my same speakers upgraded to the dual mono Clari-T and is glad he did.
Did you ever try the Teac with the F120A Omegas? In my 11x19 living room the amount of bass and dynamics it provided blew me away (my speakers are rated in room flat to 30 Hz). Compared to the Teac the Clari-T sounded anemic and the Clari-T made any other 10 wpc or less amp sound anemic. Not that I had any real compliants regarding the Clari-T, but in the back of my mind felt (and knew what the numbers were telling me) that it was really pushing to use it my speakers. Five minutes was enough to convince to give Vinnie a chance to mod it and probably sell the Clari-T. The only probably to it is Dan's glowing reports of the B200 with the Clari-T.
The stock Sony cost me only $225 slightly used. My next serious investment will be an audio PC, rather than dump $1000+ into another transport or modding this one.