Financing a $5-7k car. Good or bad idea?

Going to check these 3 tomorrow:

Honda Civic 2003 $3650, 124k miles.

https://newyork.craigslist.org/stn/cto/d/2003-honda-civic-ex/6726808462.html

COROLLA 2010, $7450, 95kmiles
https://newyork.craigslist.org/stn/cto/d/2010-toyota-corolla-le/6743988104.html

RAV4, 2006, $6,900, 123kmiles
https://newyork.craigslist.org/stn/cto/d/2006-toyota-rav4-sport-awd/6753916160.html

I think ideally I would take a personal loan and finance whichever of these 3 I go for. I would put down $800 - $1000. Then pay off my PayPal then CapitalOne Credit card by March. Then just start paying the personal loan. By April onwards I want to start paying $1k/month towards student loans. I finish a masters degree next summer and 6 months after that my loans will leave defferment. I want to wipe away all credit cards so that come next April I'll only be paying car insurance & student loans. Then save for a condo/house down payment.

Thoughts?

/r/personalfinance Thread