I have a very new website, www.hostgator-hosting-review.com
All I have in mind is to have this site top rank in search engine, beside giving a nice layout. I still cant find a good combination, so it bring me here.

1. I want to keep the H1 header "Hostgator review & hostgator coupon".
2. I want to keep the all four "hostgator coupons" code in the middle of page.
3. I want to keep the RED look & feel.

previously i have another site hostgator-free-coupon.com which look better, but not ranked well. so this time, i want a site that can ranked well instead.

I know the new site not look good. How can i make the site arrangement/design look better??

Use the H1 tag for the content title. Usually best to get some keywords in there, too. Currently you've got this in your source code - <h1>&nbsp;</h1> - which is of absolutely no use.

I'd get rid of the grey background and replace it with a white one, or alternatively as you say you want to keep the red theme, maybe use a washed out red to tie in with your preferred theme.
Also you don't currently have a 'Contact Us' link on the homepage, personally i have an instinctive distrust for sites that don't give me the option to contact them. Definately something you should keep from your old site.
Hope this helps.
Chris