Why bother getting a second domain name, unless it's a traffic domain, if all you contemplate is doing a permanent redirect?
Hosting is soooo cheap these days. If the second domain serves a unique purpose and you have a monetization plan I'd go with the virtual shared server that allows you to set up multiple domain names.
Other things I have noticed: When I try to use an online tag checker it says it cannot access the tags (Title, keywords, description etc) on the home page. When I try to use Google’s ranking checker it cannot find the homepage either.
But it has got listed on Google and Yahoo, and maybe in time it will get on other search engines too. It's too early to say whether it is going to be OK. If not, I can ‘upgrade’ it to a proper domain if I pay the fee.
Thanks for your interest.