My favorites are definitely the Sakura and Felicia (love the straight hair too!). But there are a lot of great touches on the Juri piece as well, I'm just not as familiar with the character. Were I inclined/able to purchase prints - it would definitely be the Sakura and Felicia pieces. ^_^
Truthfully... I wouldn't buy them because they're available here on dA. If you still wanna make money out of it, why not make the 'print' available here? Still, if I wanted one in my room, I'd just download the file and print it.
Are you going to Otakon this year? If so, will the Felicia print be there? Normally I don't buy prints due to a lack of a place to put them...but since I just bought this house, I have a bunch of bare walls that are in need of awesome.