I really like my 950 but I would'nt pay 2.5x the amount of the T1 to get it.
-950 is not solid metal through and through. Parts of it are still plastic.
-950 has 3g but it only works for the Sony bookstore.
-950 only comes in silver.
-950 is a 7" screen.
Things that have me interested in the T1.
-I like that it weighs only a little more than the 350. The 950 can get heavy afterwhile.
-I like that it comes in black.
-6 fonts to choose from. Although the default Sony one doesn't bother me.
The main reason I can see to get the 950 over the T1 are:
-Do you have to have 3g.
-Do you have to have a 7" reader.
I plan on getting my dad a T1 as soon as I can see one in person. If I like it I may sell my 950 to someone willing to pay the prices you are listing.
I think the only thing I would miss is the 7" screen.