So what are the base prices for these 3 wonder ships in the US?

Approximate prices:

Duo Discus XL 102,000 euro
Duo Discus XL T 129,000 euro

Arcus 127,500 euro
Arcus T 155,000 euro
Arcus M 180 500 euro

To these base glider prices add instruments, trailer and shipping. Depending on the instruments selected, that would add another 10-15,000 euro and the trailer will be around another 18,000 euro.

Can't help you with prices for the other manufacturers.