I got the upgrade bug bad about two weeks ago. I did speak to someone at VS and they told me the price to upgrade my existing VR 4 Gen IIs - a lot more but understandable. They were helpful and quick to get back to me. I don't have the boxes that mine came in any more though.
I've decided to splurge and move my existing VR4s to the bedroom and buy some used ones and send them off to be modded since I need the boxes anyways. Only problem is that most people who are selling their 5-8 year old VS want close to the original price on them

I paid $2,000 NEW for my VR 4's about 7 years ago(not sure exactly when but around then) . People are trying to sell them for about that! Do they realize they aren't an authorized local dealer so that they should cut the price a tad so that the risk we assume in buying them translates some how?
I did see someone selling them for $1500 but sale is pending. If I can find a good deal on some VR4 gen IIs (just because I'm used to their look) or some VR 4 SRs I'll make the leap of faith. If I do manage to find what I think to be a reasonable deal I'll let you know what I think of the mods and how long the process takes. I'm going to see if I can pay them to break them in as well as I can't leave my speakers on loud for a week.