Questions about buying a Buddha statue

How important is the hand gesture of a Buddha statue? I heard in a video that I should definitely get a Dhyāna Mudrā (Meditation) statue or a bhūmisparśa (calling the Earth to witness / touching the Earth) statue to deepen my practice... Which is unfortunate because I'm on a tight budget and found a good deal I'd like to snag on an Abhayamudrā (gesture of fearlessness/giving refuge) statue. Secondly, is it okay to buy one with a (small) crack in the plate behind the head (not sure what it's called)? As some have pointed out that could symbolize impermanence... I just want to make sure it's "kosher". Lastly, can I keep my statue in storage until I have a shrine or at least a clean and appropriate room? Or should I wait to until I have a good place to set it out? Thanks in advance!