I am a bit confused....
Do you want a beater or just a more efficient/reliable car?
First things first, you have previously mentioned that if you don't sell the X you won't have funds for the next car. So I would guess the first order of business is to make the sale so you know what your actual budget will be. Also, I think that since you are wanting to get close to KBB for your X, it may take a little while to find a buyer, which means you'll most likely have time to find your replacement while the X is on the market.
As for the CR-Z vs Versa question, it goes back to my prior question (better car vs. beater/cheap mobile). In my opinion, the CR-Z is a better car is every way except for cheapness to run, longterm maintenance (hybrid batteries etc), and initial cost. I know you mentioned auction results, but just looking on Autotrader (nationwide) there are 3 CR-Zs at or below 10k. One in Kentucky and two wrecked ones. Meanwhile you have your choice of what seems like 85% of all Versa's ever made.
On the Versa, it seems to always be high on the list of "cheapest cars to own" along with the Honda Fit so that would be a good one for saving as much as possible.
Personally, I am skeptical of the CR-Z as I don't feel it is that sporty of a car and is more expensive than a Civic and a lot of good Acuras. I know you've gotten a lot of good suggestions, but here is the top 5 (+1) I'd be looking at if I was given your 10k budget and wanted a somewhat sporty DD in New England (excluding MINIs)
1.) Mazda Speed3 (
Cars for Sale: 2007 Mazda MAZDASPEED3 Sport in Naugatuck, CT 06770: Hatchback Details - 351542217 - AutoTrader.com)
2.) Acura RSX (
Cars for Sale: 2005 Acura RSX Type-S in Stamford, CT 06901: Hatchback Details - 346982585 - AutoTrader.com)
3.) Toyota Celica (
Cars for Sale: 2003 Toyota Celica GT-S in Taunton, MA 02780: Hatchback Details - 349122846 - AutoTrader.com)
4.) Honda Civic SI (
Cars for Sale: 2007 Honda Civic Si in Kingston, NH 03848: Coupe Details - 329702742 - AutoTrader.com)
5.) Scion tC (
Cars for Sale: 2006 Scion tC in ENGLEWOOD, NJ 07631: Coupe Details - 348094542 - AutoTrader.com)
Honorable Mention Ford Mustang GT (
Cars for Sale: 2005 Ford Mustang GT Deluxe in Canisteo, NY 14823: Coupe Details - 349403618 - AutoTrader.com)