I think your decision is a wise one, Cassp.
The need to drag around a heavy keyboard is not necessary with the availability of the PSR-3000 and S900...they will do MIDI files superbly...plus they have features the G70 doesn't have, like SA and MEGA Voices, USB to device(no floppies) and speakers...you can even plug the XK-1 into the available inputs and play it through the PSR.
There are many pros on this forum, besides myself, that use the PSR series and find it far more practical than a heavier keyboard.
They are excellent units.
The Hammond XK-1 is a killer...one of the best I've ever played(the Leslie sim is wicked!) and it's also light and easy to manage.
Good luck with your new acquisitions.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.