Hoping to go silver...

Hi all,
I'm off to Vegas in two days
flying in cattle, as usual! Coupled with my Orlando trip in November
I will only need 3 more tier points to get silver (hurrah!)
So I was wondering... are the benefits so good that I should aim to get silver by taking a flight sometime before my first FF anniversary (which, I presume, is when my first VA flight was, in August).
And if/when I've got silver, how much is it in my interest to keep it. As you can probably tell, I'm new to the world of VA, but they've already topped my list of major carriers, mostly thanks to some god-awful experiences with AA.
I'm sure this has all been covered before (sorry, if that's the case!) but if I reached silver, then lost it a year later, would I keep my miles?
Any feedback would be much appreciated.
I'm off to Vegas in two days


So I was wondering... are the benefits so good that I should aim to get silver by taking a flight sometime before my first FF anniversary (which, I presume, is when my first VA flight was, in August).
And if/when I've got silver, how much is it in my interest to keep it. As you can probably tell, I'm new to the world of VA, but they've already topped my list of major carriers, mostly thanks to some god-awful experiences with AA.
I'm sure this has all been covered before (sorry, if that's the case!) but if I reached silver, then lost it a year later, would I keep my miles?
Any feedback would be much appreciated.