The thing is, I plan to upgrade around December, to probably a full blown LA7000. And I dont plan on buying another DAC, for many many years.
In that case I would go for the latest and greatest. Since you intend to utilize USB at least part of the time, the new model will be more of a sure thing. Some computers didn't pair well with the prior model via USB for some reason. The new update should be pretty much guaranteed to be reliable due to the chipset used.