Hi I have a 2010 iMac and am considering putting an additional SSD in. However, it came to me to think, can I put the additional one in, then also just replace the HDD as well and have two SSDs? Will this need an additional cage or something to hold the SSD in place? Anything specific about the 2010 model as well? Also, should I be looking at specific SSD models or can I pretty much go with whatever feel like? Recommendations? Thanks.