Interesting thread, indeed.
But as for me, the answer is obvious - WNW Felixstowe. And with extra I paid for quick delivery from NZ, which still was not quick enough to get it for Christmas, and unevitable VAT added here in Poland, it was well, well over the basic called price of USD269... Yet, I do not regret any cent spent on it - building this model was and will long remain the best modelling experience I had in my 40+ years modelling time.
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BTW, at the Lance's point on value per time spent on building, I do not count per hours but per weeks. And some of you may remember my count which I showed when completeing that 5-month project, where it turned out that price per week of modelling was lower on WNW Felixstowe than on any other WNW kit I built.
As for Dave's question, regarding buying the kits as collector, I do not understand that attitude at all. Me, I buy exclusively with the intention to build, I am lucky to limit my stash to about 10 boxes. Right now I have 10 WNW kits and two other 32nd scale non-WNW ones, and I would have not exceed 10 if it was not for the demise of WNW and my decision to get those kits, which I still would like to complete and add to my collection. I learnt that if I exceed this number, I may change my mind and decide not to build a particular kit. Then I attempt to sell such a kit as soon as possible, for space issues, among others. I prefer to have a cabinet full of completed models, rather than a storage of boxes with untouched sprues.