I don't believe OnApp yet supports VMWare. May want to check on that. Rest of it looks alright, What San's units are you looking at?
3Par is probably one of the best brands out there right now. With the Thin provisioning. (Only uses what it needs)
Some of HP's Storageworks are pretty decent and scalable.
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KVM better than Xen? In terms of quality, support and ease of use?
I think that quality and ease of use is on par with Xen. It is the new kid on the block, so there will be less people using it, meaning that there is probably less documentation. But it is gaining traction.
I do know that KVMs are generally faster than an equivalent Xen VPS, according to a bunch of articles and reviews that I've read.