The 6X10 DD will probably end up being your main coil. It is a great target separator yet large enough to still cover some ground. You won't need the 5.3 until you get into heavy trash like tot lots, picnic areas, sports field sidelines etc. Pin pointing with it can be a challenge at first but before long it will be no problem. It's also nice to have a DD coil when you run across some nasty ground. So, when the 6X10 gets there, say hello to your new best friend because you will be spending allot of time together.