I don't think there are any SSD to SSD issues. Really, I haven't even seen any HDD to SSD issues with Windows 7. Just go ahead and update the firmware (if necessary) before you switch over to the new one.
It's not necessary for you to do a clean install. Just copy the partitions and then resize your OS partition (if you want to). I used partition wizard for this.
Do use a specific partwiz?