I guess it kinda depends on how often you will use the kayak and the seating comfort level.
The Jackson Big Tuna is a superb and luxurious tandem kayak, the seats and roomyness are to die for. Last Spring, I found up a like new Jackson Kraken (solo) store demo from my local outfitter for $800 off regular pricing, maybe you can try that. Outfitters have Spring sales to get rid of last years inventory or make them an offer.
If you kayak fish only a few times a year I might recommend the Vibe Kayaks Yellowfin 130T for $1100. It has good seating as well.
Another option is the BKC UH-TK219 12 foot Tandem Sit On Top for around $800. Wilderness Systems & Jackson also make sit-in-side tandems with great seats.
Not positive, but I think you would be sitting in the front for easier casting. Be sure to test out the legroom in whatever you decide on.
Personally, I would stick with a name brand, one gets what one pays for. I had a cheapy kayak and couldn’t wait to get out and stretch after 3 hours on the water. With the Jackson, I can recline the seat and fish 8+ hours no problem.
Also, don't rule out a small canoe, Bass Pro and Academy Sports have several models for around $600 or less.
Buy a name brand used or store demo model. Just my humble opinion.