weight scale recommendation

[Dion Hildebrandt]

In an effort to 'work on my combo' I figure it would be in my best interest to have a set of race scales at my 'race shop' (aka home garage). I have a number of questions about these race scales,
1 - what would be desireable features, 4 corner ,total wieght, compact , etc.?
2 - what brand and model would offer the best bang for the buck? ( I dont want to spend a fortune on these things)
3 - what would be an optimal weight bias front - rear? 52/48%, 50/50%, etc?

Thanks in advance for any opinions and suggestions