WHICH ONE TO GET?

Lover of smoothies, nut butters, and dairy-free milks. I love cooking and wanted to get a Vitamix as a birthday present to myself, but I'm overwhelmed with the amount of options available. I want something around $350-500 (refurbished is fine with me), not too loud, and not too complicated to use. Also, what's up with the wet and dry containers, and do I really need different containers for my Vitamix? Which options would y'all suggest? Thanks!