TI Nspire (Non-CAS) vs TI-84 Plus Silver Edition For The ACT?

I need to get a graphing calculator for the ACT, but which should I get? I know the TI Nspire is a much nicer calculator, but will the TI-84 Plus Silver be good enough? I don't plan on going into any advanced math in college, so I just want what's gonna help me most now. The only reasons I really like the Nspire a little more are the higher screen resolution, the more modern OS, and the TI-84 emulator. Also, on the package for the Nspire it says it can be used for Geometry, but the TI-84 doesn't have this. Would I need this when taking the ACT? Money isn't a HUGE issue, since both can be purchased on ebay for under $100, but saving money is always nice. So basically, from all I've told you, which should I get? Thanks