I purchasing i always ask the Universe for guidance, in what ever form it comes; sometimes circumstance, sometimes a gut feeling, sometimes timing is off, sometimes miss the opportunity.
I try now to wait for what i call the "no brainer" ie; exactly what i want, runs great, good miles, great price, not too far, gut feels right, timing is perfect. lol
Sounds like a lot to ask but i am amazed at how if i wait the right thing comes along, and often the wrong thing becomes blatantly clear.
Good luck!