New Vidya Card?

[lawlerbation the hardcore squatter]

So im thinkin of buying a radeon HD4870 for like $100-120 off craigslist and i just cant decide if its worth it ... i have 2 nvidia 8800s that i should be able to get into sli but if i bought the HD4870 i could get a job and buy a new computer and another HD4870 for sli down the road

BUT MEHHH

or i could find a new monitor?

or i could donate to Abec Stress Relief