My son is wanting to get into the variable volt scene since he is now starting DIY juices. I was thinking that it would make a good Christmas present for him but I know nothing about them and what all I would need to buy. I am hoping I can come in at $100.00 or less, but I don't want to buy low quality. Can I get some advice/opinions from you guys as what to look at at getting and what all I would need to get?