I'm not sure what they cost but what about the Daiwa BG ?

daiwa bg5000 would be good, only 10kg drag but through a long rod thats all you need. 

I have an Okuma Salina and have caught enough kings to 15kgs to vouch for its use and also caught a 25kg GT on it from Autitaki. Dollar wise would fit your budget. ANother one worth looking at would be the Opus Bull.

Okuma Azores.

Would the Azores 55 or 65 be comparable to a Shimano 10000 reel?

What about a fin nor offshore 9500? There pretty cheap on eBay around $180 or would that size be a bit big for casting?

Mate I dunno if you bought anything yet but definitely go high retrieve, high drag, all day. And remember using it for topwater will eat a cheap reel quickly if not cared for correctly. I bought a Stella 14000 then went back to my thunnus 8000 the other day as i was getting the Stella serviced. I was amazed at the difference going backwards. The thunnus I had used for about 3 years prior got smoked, more markedly, and the amount of winding was very very noticeable.
Don’t let anyone tell you 15kgs is all the drag you need. I listened to multiple convos and found that theory to be subjective opinion. You can do with less drag sure, but when you get that one monster that thing will melt. (Not literally).Crank that **** up!

Maybe take a look at the new Penn Slammer ||| H in 6500 or 8500 not overly expensive, strong gears, big smooth drag stacks.
Might be an option IMO

you'll build some good muscles with the finnor offshore 9500, its heavy and a bit clunky but built like a brick with some good power. might be better looking at the 7500 instead if you want to go that route, its smaller, lighter, same drag.

I bought a Okuma Azores SW from a guy on Trade Me for $190. It blue and silwer. 65 model. Use it the other day and caught a 26 kg yellow fin tuna with it. Spooled with 50 lb braid. It cheap but done the job for me.

Don't be fooled by the " you need 25kg of drag" stuff. Most of the time you not even using 10 kg of drag. It more likely 6 to 8 kg of drag.