The high-class sets are always a blue chip stock in my book. BUT if you are wanting to sell in a years time, yu aren’t going to have a good time. You need to hold this at least 3 years to have any reasonable return.
Buying singles would be the best for high ish returns or you may loose some money doing so. Boxes are for long term appreciation and singles (if buying the right one) can get you a higher return.