#54 is awesome. I like keeping the color scheme throughout the logo. I wasn't a big fan of the the multicolored buildings like in entry #52.
Try throwing some other variations off of what you did on
#54, such as maybe a brighter green, just to see how it looks (it will probably look better the way you have it, but I'd like to check it out)
http://images2.layoutsparks.com/1/234862/neon-green-default-layout-1.jpgAlso, I like the palm trees on the side, but a few of my reps have made comments about them. Maybe try doing something else with the space on the right... maybe a splashing wave effect or mountains or something. I like the palm trees, but it would be good to see what else can work.
Great job, this is definitely in contention for my final logo!
Doug