[color=#000000
ost_uid0]There's no reason you can't reserve [i
ost_uid0]both[/i
ost_uid0] names. For example, you can reserve five-minute.com, make that your main domain, and then forward fiveminute.net to it. You might even want to do for a while that with the .ar domain you already have, which some people might be using.
Registrars all perform the same service, which means I would select by price and additional services. I've had good experience with GoDaddy, which charges $8.75 (last time I checked) and has some good additional services (including domain forwarding, email, etc.), many of them at no extra charge; their support has also been pretty good. In any event there's no reason to pay more than $9 for a domain. I would definitely avoid the two registrar dinosaurs, Network Solutions and Register.com. They overcharge and their support is terrible.[/color
ost_uid0]