He could SLI two of them. I don't know if that's an option on the lower end cards, thought.
Its not. The first card to be SLIable is the GTX 650 Ti, and you can only run two of those.Even THAT isnt SLIable.
You're really better off saving up for a mid range card. Stop short-term buying - you're just going to replace the card in a year because the new market of games is going to hit us hard in the next year which will quickly render your games unplayable with such a cheap card.
This isnt something you can cheap out on. You cant HAVE a video card without a power supply that supplies the proper amps and connectors to the card - you cant even have a PC without a power supply. In fact theres a whole bunch of other components you cant forget about either - the motherboard, the CPU, its cooler, a hard drive, a PC Case (but some badasses build one without a case anyway), the CD/DVD Drive (though this is fairly cheap, you can find one for less than $20), your video card, and your precious power supply to give everything its juice.
Now, I will admit, in recent years, custom PCs have been getting steadily cheaper. What you could get for $1000 back in 2008 is what you can build for probably $600ish nowadays.
I recently helped someone build a budget gaming PC that was around $700-800 and it runs everything (as of current games) at
max settings - and by this I mean an average of 50FPS+. So you're better off with one such build (with some cutting corners in mind) for Christmas or the like.