I agree with the Evil Bird above. The DTA 100a is supposed to be a much better sounding amp. I have one and it sounds great. If you go with the Dayton speakers be sure to add some sound deadening material inside the cabinets. From what I have read is that this really improves the sound.

If you decide to go with the GF DAC-11 or the Maverick DAC-1, you may want to ask Tom at Class D audio if he can adjust the impedance of the 254 amp for a lower gain preamp. Both the GF and Mav have a lower gain and don't play as loud as the amp can go (its not a big deal if you are not using Magnapan's like me or you like to listen at ear bleeding levels). The Tube Magic is great for the price but the GF is better IMO. Both are very good for the money. Another option for a preamp is to check out used gear on augiogon.com There are some great deals on some nice used preamps. But if you want a DAC/Preamp combo the GF and Mav. are the way to go.