So if anyone has any thoughts or opinions on my choices (or even other options within my budget) I would welcome any suggestions! Conversations with the dealers have only served to confuse me as they all say that thier brand is the best and I'd be mad to choose any other. The Yamaha dealer said the kawai would not last as long but my tuner said this is rubbish.
Assuming these are AUD prices, the price you have been offered on the K3 is excellent, the price on the T121 less so. If you like the tone and touch of the K3, I don't think you should let further discounting of the T121 lure you away. You can't beat the Kawai warranty and there is a lot of value packed into the K3.
A small point of clarification. Although the Samick-produced Alex Steinbach has parts from Korea and elsewhere, it is built at the Samick factory in Indonesia. I'm not saying that's of any importance, but it's a fact.
Bernstein Music has the full line of Hailun pianos branded with the Bernstein name. These are from China. They have attracted a following in the US (branded as Hailun). If you have a Bernstein Music location in or around Adelaide, you could check them out. But again, if you like that K3, I don't think you could go wrong.