Hey Prayze...... I own the XV-88, I don't think it would fit in a 76-key case seeing as it has the full 88 keys. The weight is approximately 50-60 lbs, the dimensions are something like 55"W X 16"D X 6"H (Width, Depth, Height) I don't know the exact dimensions.... but I think you can find them on
www.zzounds.com or
www.rolandus.com I built a case for mine, so I can't help you much past what I did. You may want to look into building a case if you are not interested in spending $300-$400 on a case. I built mine out of wood and some eggshell foam (I did get this for free) it cost about $150 for all the hardware. You'd have to make sure you got it exactly the right size though. Hope this helps.
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John 3:16 For God so loved the world, that He gave His only Son, that whoever believes in Him should not perish, but have everlasting life.