Dreamer,

Sound quality is the same, with same effects on both, aside from the COSM effects found only on the XV-5080.

That's a tough decision, since you already have sampler playback capability (which is really the weakest aspect of the XV-5080, at this point with the current OS).

Just remember that you'll also have to buy SIMM (up to 128MB can be installed, and is not included).

The question is if you think COSM is worth the extra $$$.
www.xv5080.com and the lakewood site (the link can be found at the former site) have good comparisons of features: worth a look.

Chris

Sound quality