I would HIGHLY suggest buying a handwound 540 from John Robert Holmes today. He got a whole shipment in last week and sold every single one of the "comp turn" motors in a day or two, but he still had a few 55 turn handwound motors. He's not going to be getting any more of these motors for a very long time, maybe never, so I would REALLY REALLY REALLY suggest going over there and getting one. It's only $20 more than a cheap lathe motor, and honestly I would venture to say that it's worth $100 more, it's something you can't understand until you've done testing and compared the two. If you don't know who John Robert Holmes is, he's the PREMIER electronics expert specializing in high performance crawlers. He's highly educated in the electrical industry, and he's a competition crawler so the two make a perfect marriage of knowledge. IMO there's not anyone that I trust more than John Robert when it comes to need information on something electrical for a crawler, and really most other forms of RC as well. This cat has a bicycle running on a mamba monster and 6S LiPo with an insane brushless motor lol. Anyway, he designs and builds his own motors. He has them handwound by motor factories, but they're built to his exacting specs. He works on motor sometimes for years, until he gets them absolutely perfect, prototyping, testing, revising, and finally when it's ready he gives them the go ahead. I have at least 7 of his crawler motors, and it's the ABSOLUTE ONLY motor that I'll run in my rigs.
http://holmeshobbies.com/product.php?productid=199&cat=0&page=1
You'll have to select 55 turn from the drop down menu, because he offers a lot of different winds.
As far as the difference in integy and Novak, they're both "ok" motors. I've tested them directly against one another and I find the Novak to be a lot smoother, which I really like a lot. Either one will get you started though, but I would reccomend the Novak as my personal suggestion, just based on the testing that I did and the way they've been holding up under a good bit of LiPo power. However, if you want the absolute best motor for the money, go get that Holmes Hobbies motor. I would venture to say that the quality is at least 5 times greater than the other two motors that you mentioned, and most likely more.