I am sure tons of them are good and you can spend a lot or a little. We got the NRS Blast Inflator. $100.00. Had it only a year, but so far it works real well. Gets a 14 foot Otter to top-offable level in 12 minutes or right abouts. Appears to hold up well. Simple, basic. Sure beats the hell out of using a K-200, which we had been using exclusively for the past two years with our Duckies...I wasn't picky.
NRS Blast Inflator Pump
I bet many of them out there are good. You see all kinds of em.
Good Luck, let us know whatcha get.