Hey, Jerry, I hate to be a pain, but I think you asked a really important question. Do you really "need" a .25? Yes, it will net you a few more ft. lbs., but at the cost of a loopy trajectory, and a limited selection of pellets. Especially at ranges less than 50 yds. I just don't see any advantage over your 350. With Predators, mine gets just under 25 fpe, and drops less than 2" at 50 yds. Now, if it's a matter of a collectible rifle, I'd get one of the dwindling number of UK models, regardless of caliber. But if you're looking for raw power, your real next step from the 350 is going to be a PCP. More expensive, sure, but you can really dial up the fpe, if that's what you want.
I've also heard the Patriot/Kodiak is a bear to cock and shoot, recoils even worse than the 350 for a very slight increase in power. Also, have you really looked for reviews? The one's I've seen were really mixed. One site was all thumbs up, another thumbs down. The latter was suggesting one of the Theoben rifles, I believe it was the Eliminator, as a much better choice. At a higher price, I'm sure. I hate to admit it, but I bought my 350 pretty much on power. I did some research, and thought I knew what I was getting into. But if I had it to do over, I don't think it's the rifle I'd buy today. Yes, it's powerful and accurate, but it just isn't fun to shoot. Compared to my CFX, it's just too much like work. So you might also ask yourself, do you really like to shoot your 350? If the answer isn't a pretty resounding YES I think I'd empty that cart and do some more shopping. Just my opinion, for what it's worth, good luck, and keep us posted.
Dave