I don't think either of those Tsantali Nemea or Naoussa offerings are particularly interesting, but they could give you an idea of what an entry level Xinomavro or Agiorgitiko tastes like, when made by a competent winery like Tsantali. I tasted both at a wine fair in Athens in 2015: they didn't knock my socks off but were OK. I don't know the others but would tend to avoid. Tsantali makes much better wines than those.
I've had 2 bottles of 2008 Alpha One in the wine fridge since 2015, waiting to put some "cellar" time on them and open them for a special occasion. I live in hope but have no actual experience of the wine. The reviews are good (plus a label on the wine says Mr Parker has estimated it as a 91, doh). It looks as if the formula has changed, as the ones I have are 100% Merlot. I'm also waiting for my more ordinary Merlot/Syrah/Xinomavro 2011 blends to get rounded by age, as I found them a little underwhelming when last tasted 5 years ago.