Buy a cheap Arrow fly the **** out of it and get your CFI/II in it. Continue to fly in it and heck since you have the cash sell your CFI/II services in it. Make money with this is what I'm getting at. Don't just try and goodwill your services to others by saying just pay for gas... actually charge them what it costs for the airplane and your dual. While doing this go down to a place like Ari Ben/Aviator and buy a 100hr multi package that includes your MEI. That will cost you about 15k and is much cheaper than the down payment for the twin's you're looking at. Here's a couple sweet Arrow's with everything you need. BTW you can also snag one for cheaper.
1979 PIPER ARROW IV Piston Single Aircraft For Sale At Controller.com
1979 PIPER ARROW IV Piston Single Aircraft For Sale At Controller.com