Well, Music Stars are fun, so are the V5s mentioned... I love my Angels.
The Tama-Go is nice for a while then it all of a sudden looses its edge and people complain of the size... (Not a issue to me, I have a bigger Bandai toy pictured in my log MarshmellowDelights) The figures add to the fun for a while and come with a shell in-lay design.
I have 5 Music Stars, 4 in which are open... I enjoy those. They connect with each-other and the V5 and v5.5 and the Tama-go Most of them have touchy buttons (Responce isn't the best, but you get used to it) I find them pretty unique.
Angels are part of the originals. I'm sure you know that. I LOVE mine. I like playing with them and they have a touch sensor on the side which makes it a bit more interesting then the original p1/p2.
Angels use LR44 batteries unlike the newer connections...v1-v6 (CR2032) and the Tama-Go (AAA)