Yeah, the number of syllables in the number is a big concern for me as well.
My cherokee has a great tail number: N500KC
It's very memorable, looks great on the tail, but it's a bit of a tongue-twister: five zero zero kilo charlie. It gets abbreviated to five-hunnert' kilo charlie pretty often both by me and by ATC, but we all know that's improper
I thought about getting a 'sister' number to the cherokee, like 570KC, that way I can be in 'zero kilo charlie' no matter what I'm flying, but I don't think I really like that idea either.