Record Doctor V Vacuum Cleaner. $200. Also, checkout the Humminguru Ultrasonic thread, lots of guys just getting there's and feedback incoming.
I've had an Okki Nikki for a few years and only have positives to say. But as @JohnnyCashFan said I'd check out the Humminguru thread. If I was looking for one and given the price point of the HG I'd be paying attention to user reviews.