You can absolutly do SACD and have a dac, but you need extra cables...
Get a decent but not rediculously expensive CDP with SACD capability and run the analog into your Aux input, and Simply get a Sweet DAC which will hold its value for redbook, and you can very simply put the analog cables from the DAC right into your CD input, and still use the same CD input with the same set of cables to just change the input on the DAC when you need to run a hard drive computer source or whatever... This is the most versitile, and capable way to get it all and not loose a ton if you decide to sell something..
If you invest in a single player and upgrade I can tell you that all these big dog players are going to probably drop to about half value again in the next 2 years, because MASS storage redbook media is rapidly taking over and quite frankly some of the software and media units being sold today can compete with sending 1's and Zero's just as good or better(even in the jitter domain) Vs. some of the top transports today..
Of course this would give you capability to switch between the redbook and SACD layer on a hybrid on the fly and you might find that a Good dac will sound better than the decent SACD player. But truth is important :)