Balancer option

[X-Oracle]

I want a balancer option which works like this :
First we make an ordered list,

1.the balancer should pick the first,
2.If first one faild, then goes to second,
3.if second failed then goes to third,
4. ...,
5.If all fails then goes to fallback.

OR

Use something (like observatory or burst observatory) to ping all of it and connects to first one in order that has the ping.

Its mechanism is similar to leastping and leastload. But gives more control to user for what should connect it fails.