Teacup Yorkshire Terrier

I am getting a puppy soon and have researched the breeds but I am still not sure what breed to get..I have narrowed it down to,
Cavalier King Charles Spaniel,
Boxer,
Yorkshire Terrier (maybe teacup)

If there is a breed that you think is better than these please let me know as I want it to be a very friendly dog, and if you think one of the ones i have put down, which one!!???
Thanks!
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CKC's – very low key dog. After age one, pretty much lap pups. (that's what they were bred to be) If you want to have a therapy dog, this breed is great. They do require daily brushing but are not yappers. Really nice little dogs

http://www.dogbreedinfo.com/cavalierkingcharlesspaniel.htm

Yorkies – first, there is no such thing as a teacup; this is a term unscrupulous breeders use for tiny dogs that have been bred down in size. Remember generally speaking the smaller the dog within its breed the more likely it is to have health problems. Anyone breeding for tiny size often throws out other considerations, like genetic defects. They can be yappy. The mistake most people make with a yorkie is to treat it like a baby, carry it everywhere and then the dog is afraid of everything. These are terriers, by gum! – tiny terriers, yes, but still terriers. They need to be treated like dogs (I don't mean that in a bad way) You do have to be careful not to step on them.

http://www.dogbreedinfo.com/yorkshireterrier.htm

Boxer – whole other end of the spectrum, you have to be careful they don't step on you. They are a great family dog but because of their size REQUIRE obedience classes. They are incredibly smart; clowns with a remarkable sense of humor, loving and loyal. They love to romp so again the opposite end of the spectrum from the CKC. Prone to heart problems so be sure and use a reputable breeder.

http://www.dogbreedinfo.com/boxer.htm