A 6" .22 thick blade will be heavier than you probably think. The clip point ABA is great, but it is going to be expensive. A good lighter weight option is a High Street - smaller than what you are looking for, but has a nice clip point that you can send to someone (busse, or someone like Horton) to sharpen the spine like you asked.
Really, and lots of folks do this, is just buy about 4 or 5 of the ones you are thinking about, hold them in your hand, and sell the ones you don't want to keep. If you just watch the for sale Busse forum, and keep track of typical prices, you'll probably break even or close to it - maybe lose some on shipping or something, but it will take the guess work out and you'll get exactly what you are looking for.
One last thought, and this is my opinion, is to make sure it has a rear talon hole, and hole behind the choil so you can put in a D guard (most do though, but not all). This will protect your hands from sliding down the handle if you stab something hard. Better than slicing your hand open.