Lg optimus m question?????????????????

I was wondering if I should wait for other android phones to come out on metropcs before I get this one. But then I'm thinking the newer ones will probably be more expensive. So should I wait or just get the lg optimus m (I really like it but I don't want to be disappointed if something new comes out). Also I'm looking to make my decision soon. OH and what 32GB memory card would fit the lg optimus m (preferably off of amazon.com cuz it's cheaper lol)