Hi,
Here are few things you should keep in mind before making a purchase.
1. Type of water you are gonna use your kayak on.
2. Build quality and material of the kayak.
3. Type of kayak - There are different kinds of kayak available in the market with different purpose. Some of them are - Sit-on-top kayak, sit-inside-kayak,
inflatable kayak, etc.
4. No. of seats you require and kind of comfort offered by the manufacturer.
5. Storage facilities available in the kayak
6. Capacity of the kayak
7. Last but not least, what all accessories are included with the kayak.