You have an endless amount of choices in your price range. It really comes down to what specific criteria you have. For example, is the size of the amp a big factor in your choice cause space is limited? Do you want to go with a half bridge style amp or a full bridge type? Do you have a color preference on the amplifier? Do you need good quality onboard Xovers? Due to the subwoofer being an oddball 3 ohm and everything these days making power at 1 ohm, that kind of ***** lol. You have to buy a pretty powerful amp so that it gets you decent power at 3 ohm. If you go for the Korean half bridge amps, this can be a little pricey and if I was in your shoes, if I’m gonna spend the money I’m gonna want the better of the Korean offerings. If that’s the case I’d go for something built by Zenon factory, brands that use that factory are ampere audio, amp lab, incriminator audio, crescendo etc. If you are open to full bridge amplifiers which are more efficient a taramps would do the trick but the onboard Xovers are junk. These also tend to not like low voltage but in your application I highly doubt you will even get close to that. Good news you can buy brand new and be under $300
. If im not mistaken, your sub is a single 3 ohm, not a dual 1.5 ohm so 3 ohm is your only option