I bought my Shaver HD-8, full hydraulic tilt, used on Ebay, for less than half of a new one. Did have to replace a spring after driving about 100 posts. Got that through Kencove, who's were about half, compared to a Shaver OEM. Other than the spring, no problems with it, and it drove about 400 posts.
I'd recommend getting the hydraulic tilt. Well worth the extra money, as you'll need to do some tweeking as you drive. Sure beats cranking..!!