Go for stability, not just size. Just because the host if offering you unmetered and unlimited space, doesn't mean you should soley base your decision on that.
Think that jumpline.com will suit your needs. they offer nice website hosting solutions that will suit all your requirements I think.
So far, you will experience any downtime, and the servers will be fast.

Thanks a lot for your comments and useful suggestions and alternatives.
Finally I decided to give ultrawebsitehosting.com a try. These guys look to be the most attractive in terms of pricing, customer support and hosting packages.

We can find many hosting providers. But to find the best amongst them is a big deal. Prices are not always to considered as a prime moto. One should check how old is the company in Hosting industry. Then 24/7 support services are what matter now days. Managed Hosting should be taken into consideration.