The Lionstracs board seems like a work in progress, and as anyone will tell you, unless you have unlimited time for tweaking and style creation and conversion, how an arranger sounds and plays OOTB is a very important thing.

The one thing you get from the Big Three is very well developed styles, with perhaps Yamaha or the E80 getting the nod for 'best'. A lot will depend on whether you develop your own styles, or expect them to 'pop' as soon as you get your arranger. The Lionstracs arranger is really a sort of 'computer with an attached keyboard' with all the flexibility, and steep learning curves that this implies. And sonically, you will have a lot of work to make it as overall good as your VA7...... While many sounds are spectacular (Giga and B4 especially) they are a lot more work to balance with each other OOTB. All the balance work is already done for you (mostly!) with Big Three arrangers, and there is a far greater range of choice OOTB.

You haven't had a sampler in your arranger prior to now (unless you used the Varios thingy much in the VA-7), so are you sure you will really need one? A BIG problem with hardware samplers is slow load up times, compared to a computer - at best 1MB/sec, and usually the keyboard is dead during load time. So you have to decide for yourself if you just need the sampler for a better piano (which you will definitely want for the Korg!) or you really want to use sampled loops and other highly specialized stuff, which will make the load time more of a factor.......

If I were you, especially in light of your already familiarity with Roland's OS and basic sound (the V-Drums are in it plus a killer piano and the BEST Hammond in an arranger), the G70 is definitely worth trying out. If you HAVE to have a sampler AND 76 keys, then the PA1XPro is just about it, but beware of it's 48 voice polyphony, something that becomes more of a problem if you use a lot of stereo samples.......

As to the future, who knows.....? Maybe Yammie will finally realize 76 keys is not the kiss of death (and add USB2 sample loading)..... Maybe the E80 will come out in a G70 form factor and allow unlimited external patch selection, so you can use a rack sampler....... Maybe Korg will marry a great arranger OS to the Oasis. Maybe Lionstracs will come sounding as good as a Tyros2 OOTB........

We can but dream.....