What's the Best Security Certificate for E-commerce Site?

[amson]

I intend to set up an e-store, I have already chosen to host it with simplehelix.com, they have optional "SSL certificate feature" in the plans, so I was wondering what type of certificate will be the best to choose?

[moisture]

I think that 128 or 256-bit encryption certificates are quite enough to be used for an e-commerce site. By the way, Namecheap.com is offering Positive SSL Certificate for free http://www.namecheap.com/