Other than Alidropship hosting, I recommend Namecheap. If your site is so big, buy their VPS plan. Site transfer of Namecheap is the smoothest and fastest I experienced, they will give you a one year free subscription if they cannot transfer your site in 24 hours. Performance of your site is fast and reliable with superb and flexicle support. In terms of cost, their VPS plan is cheaper than most shared plans of other Hosting service.