I'm a big DIY kinda guy so I say build your own, but with that said, I've done the retro-fit thing too. The main issue with retro-fitting anything is that it will have to be modded to work right and most times it doesn't end up looking like it belongs. I usually spend weeks out at the local yards gathering ideas, taking measurements and playing with stuff before I make the build vs adapt decision.
I'm in the process of doing a magnum swap and have to come up with something for a shifter that will work with the 46RE trans, has an OD button and is easily adapted.
For example, the neon console along with the PT cruiser has a removable shifter plate along with decent styling and enough material to be adapted. The main issue with those is the e-brake handle being integrated.
I'd also like to take a look at the LX body style consoles but they look a little wide and not too sure about how it connects to the dash at the front and how that would mate to the a-body dash.
Anyway, back to the point. Neon console with hammer shifter. The shifter cover plate and console depth are the 2 sticky points. It'd be fairly easy to make an oval cover out of thick lexan ( heated in the oven or heat gun then sagged to be sort of a bubble then trimmed to fit ) but you'd have to play around with getting the gear indicator to be usable.
If the console is too shallow, just about no amount of modding will fix that, but if it's too deep you could use spacers to move the mechanism up enough to clear everything
but it did fit the style of the cars interior at the time ( kind of rounded hard lines like the dash ) . 
