IME, hostgator's shared hosting servers are very slow. They have a per user resource usage limit on their servers. When you add a new domain to your cpanel you will have slowed down other your web sites, due to one of your sites usage. Also, If you have some files to be downloaded by visitors their real time bandwith is suck! just 50k/s download is not acceptable todays internet.
I recommend you, If you have enough linux admin experience you should go with linux vps on linode or any other isp. you can choose your linux distribition and datacenter location for your visitors and seo purposes.
when you check your websites stats from your webmaster tools you will see you get fastest website report on the world other than shared hosting.
Just my two cents.