A good strap for changing the bass angle? Maybe?

[double_stop2584]

Hey folks.

I have a Warwick Thumb B.O. 5-string, and a Fender Geddy Lee Jazz.

I'm looking for a good strap to change the bass's angle. I currently play with the bass a little higher than 90 degrees, and I'd like to have the neck farther up, with the bass at about a 45 degree angle. I play both upright and electric, so I'd like to get the electric more like an upright, just not exactly.

So if anybody knows a good strap (preferably not a slider strap, I don't wanna deal with that), please let me know! Thanks!