Hi Andrew,
Glad to have you on board this great forum!
Here's my advice... Why put a brand new engine in a used car?... especially one that you are planning to sell. I would buy a used engine for it.
Try searching on
http://www.car-part.com here's an example of what I found:2007EngineNissan Versa RG TG 46,000 R3968 $400 AutoGator Roseville-PRP,PAR Member USA-CA(Roseville) Request_Quote 1-800-833-9292
There are a number of used Versa motors in CA for well under $1000... most of which should be in perfect running order. Shipping will probably be another couple hundred bucks.. but you should still be able to get a used motor delivered to a mechanic's shop for under $1000.
First... find a local mechanic who is reasonable and get a quote for an engine swap. Check your dealer's labor quote as well.. but at the typical dealership labor rates, be prepared to have a local mechanic or shop do the work. I would think you'd be able to get it done for $600 to $800 or so.. including new fluids, some belts, and other maintenance items that it makes sense to replace when the engine is swapped.
So I would imagine you'd be somewhere around $2k or less installed.
As for selling the car... check edmunds.com as well to see what they recommend for a fair market value. I would think that with 100k miles you would be closer to $6500 or so than $8000... But i could be wrong... especially if gas prices go up again this summer...
If I owned the car, here is what I would do. 1.) Check and compare prices for labor to install the new motor. 2.) Call around to the different salvage yards on
http://www.car-parts.com and find a good deal on a used motor. 3.) Put the car on criagslist as-is.. but with the information on the exact motor and price as well as the quote to install.. If it can be done for $2000 including labor.. advertise the car for about $2500 less... the buyer should get a little better deal for taking the risk and doing the legwork.. Give it week or two to see what happens. 4.) If it doesn't sell on Craigslist... then see if your boss is willing to spend the $2k to have the new motor put in. 5.) Then sell the car on craigslist with the new motor installed and all mechanical issues taken care of...
Good luck!