A lot of Rivendel homes have had the supply line replumbed (up and over with CPVC mainly) this is a bonus if you find a house that has already had it done. Typically this cost about $3800 - $5K, it used to cost more but they got it down to a science now and all the plumbing companies seem to do it.
Just keep that price in mind when evaluating homes for sale, OR when negotiating you deal.
If you are looking for an agent I would be glad to help you buy.
Feel free to contact me.
Albert Wooster, P.A.
Tammy Hayes, Realtor
Green Lion Realty