I'm not sure you need a DAC. You can connect your TV and your iPOD with RCA connectors to any input on the new integrated or receiver.
For subwoofer later, you can connect via the receiver's preamp outs, or if it doesn't have preamp outs then can be connected via the speaker cables (make sure the new sub has these inputs).
The Martin Logans are good speakers, I've heard them several times at shows. The reason I think the Tekton recommendations are better is because they are less expensive and they are very amp friendly, IOW they are easy to drive. Most logans that do not have powered subs (like the ones suggested above) are the opposite, difficult to drive so they would likely need a more powerful/more expensive amp.
But also keep in mind that there are many many choices besides the few that have been recommended to you (speakers and amps). You should use these recs as starting points to find what you want.
For subwoofer later, you can connect via the receiver's preamp outs, or if it doesn't have preamp outs then can be connected via the speaker cables (make sure the new sub has these inputs).
The Martin Logans are good speakers, I've heard them several times at shows. The reason I think the Tekton recommendations are better is because they are less expensive and they are very amp friendly, IOW they are easy to drive. Most logans that do not have powered subs (like the ones suggested above) are the opposite, difficult to drive so they would likely need a more powerful/more expensive amp.
But also keep in mind that there are many many choices besides the few that have been recommended to you (speakers and amps). You should use these recs as starting points to find what you want.