I would suggest a used Ego 10. They are abundant, cheap, easy to maintain, easy parts to get if needed good on batteries and factory fast setting is perfect. The 13 is about to come out and this should drop prices dramatically. I personally love the feel of it and its quiet sound signature. I have been playing since 1991 and a owned a few markers in my time, this one really is a gem. Just my $.02
Best half of the "Last Minute Men"