They're all going to try to sell you stuff. But I've consistently had the best experience with Alamo.
Regarding some of the rental companies' sales tactics, use the umbrella phrase "I would like to decline all coverage options." Or "if it costs extra money, I do not want it." There have been times when I've had to repeat things like that several times. I once had a Hertz employee ask if I wanted to choose between two options, both were extra money, as if those were the only two options. Very sleazy, imo. However, Alamo hasn't consistently pushed things at me nor do they persist if you decline.
I've used Enterprise many times with no problems. Tell them you don't want extras and that you have primary coverage with your credit card.
I would first suggest looking into any free shuttle options from MCO to your hotel. Orlando being what it is, many of the hotels & resorts around here offer complimentary airport shuttle services. Then you could go through Enterprise ("We'll pick you up..") to receive much lower rates than what you would be offered at the airport location. As for the additional charges such as the insurance, use that CSP to reserve/pay for the rental and it will already be covered under the Visa Signature benefits.
Sidenote: If this is a Disney trip... Disney offers the complimentary airport shuttles AND offers car rentals on property through Alamo. Hope this helps! 
@Anonymous wrote:I would check out Sixt, the offer some really nice luxury cars for the same prices the other guys charge for compacts. I also like Hertz, being that they are the only ones that will rent to me lol.
What's the story behind that lol