2 way, which are the best designs?

Its true though. Anybody could have tapped the egg and stood it up. Same with building speakers. In fact Im not even suggesting you get out a saw and start sawing. You just get a cabinet maker to do it. Which is probably the same thing some speaker companies do. 
Even the cabinet size is done on a computer simulation. Same with crossovers. Its not rocket science. Its just laziness that prevents people. 

There is a saying "If you owe me $100 dollars, it's your problem.  If you owe me $100K dollars, it's my problem".

If you argue with Kenjit, I wonder whose problem that is :-)

'Best 2way'...hmmm....MHO, mine.  No boxes, either....

But I'm hopelessly biased....*G*

OP, if you’re used to an active 3-way there’s no way back :-) Standmounted 3-ways are for me the most interesting speakers today.
Try the ATC 50, 100 or 110, Quested v3110, PMC IB2i, IB2SE, Kii 3, Dutch & Dutch, Sp Acoustics, Geithain or similar. Quested being a little (100 pounds!) favourite for me..
If you still want a 2-way you have the active ATC20 and the Quested v2108. Any 2-way passive or active will naturally need subs if you'd like to feel the bass.