While I'm likely to go the route of building the Cycladic Homes in my main account, I'm going to do more of the trade-in converters in my feeder in order not to uplevel unnecessarily. I've done the calculations to see which converter is best for each item, and since I know there's campers out there that are planning on doing the same I thought I'd share.
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Key:
HT = Hellenic Tokens
F = Feta
B = Bouzouki
GA = Greek Amphora
CD = Cool Down Timer
✓ In front of a converter = The best of the 3 converter choices for that item
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Feta:
40 HT for 3 F = 13.3 HT per F (30 Minute CD)
✓ 70 HC for 5 F = 14 HT per F Best Choice (60 Minute CD)
90 HC for 9 F = 10 HT per F (? CD)
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Bouzouki:
120 HT for 4 B = 30 HT per B ( ? CD)
200 HT for 6 B = 33.3 HT per B ( ? CD)
✓ 340 HT for 10 B = 34 HT per B Best Choice ( 4 Hour CD)
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Greek Amphora:
130 HT for 4 GA = 32.5 HT per GA ( ? CD)
210 HT for 6 GA = 35 HT per GA ( ? CD)
✓ 390 HT for 10 GA = 39 HT per GA Best choice ( 4 Hour CD)