Which drum kit should I buy?

To decide which drum kit to buy, ultimately you should consider where you are in your drumming journey, and where you see yourself going in the coming years. If you're just starting out then there are some excellent starter choices from most of the major brands. For example, Tama and Pearl.
If you're an intermediate drummer who is starting to play gigs and record, then buying a mid-range kit with solid hardware and a variety colour options & finishes could be a good match for you. 
If you're a professional drummer who is playing many gigs, doing recording sessions etc then a reliable high end kit with a lot of range and tuning options will be a must have. Here you will consider options such as the DW Collectors series, the Tama Starclassic and Star series, Yamaha Recording Customs, Pearl Masters, Sonos SQ2's and Gretsch USA Customs.