I have the SharperTek XPS180-6L, which heats the solution to over 75 deg Celsius (and everywhere inbetween) and while it has some nice features like auto temp, timer, sweep and degas, I'm not entirely sure it is worth the additional cost.
I suggest you find one with a heating function and a frequency higher than 40Khz. Harbor freight makes a cheap one but I cannot attest to its reliability.
Thanks. I will look around. Maybe I will try out the Harbor Freight one. For 30 bucks, it might be worth the gamble.