Forum:Need Help deciding upon a new deck

I have an undefeated Fiend Deck, but i'm getting bored with it so i want to make a new deck. Dragon decks are great and all but cards like armed dragon lv10 cost a lot to buy online. Machines can be good with cards like perfect machine king, ancient gear golem and ultimate ancient gear golem. So now i ask, what is your opinion, i need a few people for this, on what is the best 3 types of decks, and a few cards to go in them unless you think like for example a "Kaiba Pyramid of light" deck is good, because thats already on the site.