Corksport short ram is the cheapest but also not in stock until early January. Their SRI seems to make the most sense. I just like not having change out the air filter all the time and getting a little better throttle response.
Air filter maintenance/replacement is due to the debris that can clog up the filter, which then creates air flow issues that can lead to a reduction in fuel economy. The OEM air filter filters better than any of the aftermarket intakes, which is why it's recommended to replace it at the intervals described in the owner's manual. The aftermarket options provide better air flow at the cost of filtering capability.
I have the Corksport one and I've cleaned the filter element a couple of times. I just take the garden hose to it and spray it from the inside out, shake it off, then blow dry (again, from the inside out), or let it sit to air dry.
IMO, if you want better throttle response in the $150-$300 range, a throttle controller like the Pedal Commander or Sprint Booster is the way to go. I have the Sprint Booster, and while it doesn't add any power, you can tweak throttle sensitivity to make it feel more responsive.
