Ultrascope is great I use them all the time. The great thing about them is that you can swap heads (normal, pediatric). The thing I DONT like about them, is the cheezy graphics on the clear part of the bell. Also, ultrascopes are not great candidates for engraving, you'll have to have the plastic etched, and it is round so it's very difficult.
If you want to have a stethescope engraved, I highly suggest a Littman. Several models have brushed metal bell covers so engraving would look great, and many places offer to engrave if you buy.
Models I'd recommend are Master Cardiology, and Master Classic II for engraving.