Please keep in mind that alot of pet store workers really don't know and sometimes don't care about their animals and the advice they give you usually is not correct so be careful in listening to what they say. Most senegals especially from a pet store WILL be w/c no matter what they say. Unless they can give you the name and tel # of the breeder that they got it from, consider it w/c and like someone said unless you are experienced with chams i wouldn't get a w/c especailly if it doesn't look healthy. You will end up spending money for nothing because it will not make it through the needed parasite regiment. I would reconsider buying either a veiled or a panther from someone on the forum that you know is healthy to begin with. But remember if you are looking for a friendly cham, then cham ownership is not for you. No matter what kind you get, NONE of them will ever like you. Some may tolerate you and on occasion allow you to hold them but most will only allow you to do it on their terms and only once and awhile. I don't know where you heard that ambilobe are aggresive although it is true some can be kind of be grumpy most of mine are kind of ok. I do have a melleri, a veiled, and a Nosy Be that is extremely friendly. If you want a guaranteed friendly pet than you should get a bearded dragon though because no matter what kind of cham you get you can only hope that he will be friendly and not want to bite the hand that feeds it. lol.
Good luck,
Debby