So is your consideration that you can get overnight shipping? Because those prices are quite a bit higher than Artistic Nippon, even when EMS shipping from Japan is considered. Or does Geo-Tea offer free shipping?
I have the Sansui teapot, purchased from AN ($72 incl s/h, arrived in 4 days.) The Sansui pot is even prettier than the pictures, the design is in sharp relief, not just a painting or etching on the side. It's a great little pot, with a beautiful sasame filter, adequate for any tea I throw at it, no matter how fine. I can even use it with fukamushi, and have also used it with chinese greens like gunpowder. It's tiny, but works great for one cup at a time, with my nice little 4-5 oz teacups.
I don't have the 10oz Masahito pot (approx. $110 incl s/h from A.N.) but I have been eyeing it, along with the orchid pot from Shoryu (same price, 9oz.) These would be perfect for brewing for 2, or using if you have a larger cup to pour entire contents into, and don't wish to bother with multiple steepings/small servings.
I have no doubt the quality on both is excellent.