Machine control

I'm looking for an entry level machine control system to run my scraper. I currently have Specrta LR60 receivers so I would like something compatable with them but it's not a deal breaker.
All I want is a simple electric valve that controls my blade height via the receiver.
Any recommendations that aren't going to cost more than my used scraper? I looked at a CB40 but there doesn't seen to be much info on the interweb. My closest dealer is 2hrs away and won't offer advice unless I'm dealing on $100,000+ worth of equipment.
Thanks, Twisted

Wow, you're not kidding when you say there isn't much info. From what I can find, looks like most sites that have any information are dated pre-2010. Nothing on Spectra's site either. Maybe obsolete?

I found a little info on an Apache system but that's a few years old as well. I know everyone is going the GPS route now but if I could find one of these laser machine control systems it would suit me well. I have five quarters of my own property I'd like to ditch in my spare time over the next couple years plus plenty of customer fields.

I can mount the remote display on the dash and run the hydraulics manually but there is already plenty going on in the cab and this would be one less operation especially for some of the help I get.

Apache Bullseye is a popular simple system. GPS has taking over. Straight from engineer to your equipment. Laser you need a set of long legs to clear the cab. Go slower and use the remote display.