If the 1st prototype wasn't shorter than the seekers, it would have my vote.
And is anybody else not feelin' the masterpiece size line anymore? I once collected them, but the amount of transforming I do with them is practically nil, and they take up a lot of shelf space, and do a poor job for the most part of staying in cool poses on the shelf.
I really think very hard about MP puchases (3rd party or legit), and really at this time, it's not for completion, but only particular characters.
What I don't get with the MP line is that there seems to be no direction. The 1st few toys were good till they gave us a short Grimlock. Grimlock looks great, but they should have made him as tall as the 1st Prime. Rodimus is about Grimlock's size, making The 1st Prime and Megatron seem like giants. They make Rodimus but not Galvatron. Then they remake a shorter (albeit great looking) Prime and Sunstorm (who cares?).
If I had any say the lineup would have been Prime, Megatron, seekers, Ironhide and Ratchet (the G1 toys were horrible), Soundwave and Soundblaster, blaster and Twincast, Rodimus and Galvatron, Shockwave, Grimlock, ...
I'm sure if the MP line had more a more fan-friendly direction, they'd sell more figures.