Where do you want to stay? SFX is another option to access HGVC properties - but buyer beware with them. I've had great luck, others haven't. In II you can easily get Kona Coast or maybe Paniolo Greens. (There are other options - I just see those two sitting in inventory frequently). I'm not trading in RCI any more so hopefully others will chime in with what the TPU costs are for those units to figure out what your exchange costs are for comparison.
Btw, if you use II, you can book a Vistana property somewhere else to use the discounted exchange fee, then add eplus to use your first retrade to pick up something that is just sitting there in inventory.