Complete Nick fan here. I totally see it and have since he stepped out of that limo in the cute polka dot tie. (When Chris Harrison said he didn't see what Andi saw in Nick the first night, I thought, are you blind?) He's got those soulful, intelligent, searching eyes that can make you feel really special, and I think the key to why Andi won't get rid of him for a while (not spoiled) is in the "he really sees who I am" comments. He is being real, or at least projecting very strongly that he is. This type of sensitive guy can sometimes get away with being selfish or arrogant; why is why the trait is MY 'watch out' trigger. But Nick's arrogance at this point is completely fine -- shouldn't all the men who have a connection with her feel like they have a real chance? I thought the other boys were being jealous and annoying - especially JJ and Cody.
Josh also is definitely a front runner - she can't get enough of him. He's not my personal cup of tea, but I thought he was being earnest. If anything, too earnest - he takes himself way too seriously. Location gives him big points here - she's always considered him a real life possibility.
Third, fourth, and fifth all votes for Marquel as next Bachelor!!!! I find him incredibly engaging, smart, handsome, and fun to watch. Was soo sad he left instead of Cody or Dylan or Brian! Speaking of Brian, I noticed that in her blog, Andi talked about how they played with the frog's legs at dinner, so maybe it wasn't as horrible as they showed on the episode and could explain why she is giving him another chance. And it did look like a horrible date on the episode.