In the end getting the gear that best suits your needs is what you shoudl do There is a difference between the Xa's sampling and the audio recorder on the Juno-G.

Have a look at the manuals www.rolandus.com The Juno-G's audio recorder is more set up in the linear fashion. You can of course load in different samples or sample directly, but you won't have as many options as a dedicated sampler. I mentioned that the Xa will slice and chop samples, and the Juno-G will not. TRUST ME ON THIS! You're gonna find out real fast how amazing chop/slice is on a sampler The chop feature will let you take a full drum loop, or even fully orchestrated loop, and the sampler will "at the push of a button" automatically chop that sample up into individual samples. You can take a fully orchestrated sample and completey remix it. Watching the 2nd video of the MC-808 at www.rolandus.com you'll see towards the end he chops an old school loop. It's pretty cool

If you're going to go the keyboard route I would still strongly suggest the Fantom Xa. I think the Xa will work better for your needs.

Squeak