New computer.

Hello everyone! Now Iv'e never really posted a thread on here.. (I'm quite new, heh.) but I was looking for a new computer that wouldn't be expensive, but not super cheap to where I'd get 30 fps.
Iv'e been using a mac OSX for about 5 years now, (Obviously not for minecraft the entire 5 years..)
But when using it, I only get 30 FPS with optifine. Me and my plan were planning on making a youtube channel in the future, little skits sorta like ItsJerryAndHarry. I wouldn't be doing all the recording since I would mostly be an actor, on the other hand, I would be doing Some of the recording, About 4/10 Videos. So, I know basically nothing about PC's, other than there better for gaming (sometimes, at least more so than MAC's) I have some, what you could call "specifications" down here, and well I'd like to know if there ARE any computers that fit the profile. So here ya go:

FPS/Frames: I'm looking for something that gives 60-70 FPS, then I could boost that up with optifine.

Type: Well I'm looking for a desktop here, not a laptop, so just a desktop and computer that I could hook up to somewhere.

Price Range: Well I'm looking for something under 800$, Looking for around 300-500$ (This may be over-estimated or under-estimated, like I said Iv'e been using a mac family computer my entire life. (before this mac, we had a horrible laptop from apple as well, it was horribly slow.)

Hopefully you can find something, because quite frankly I have no idea what to search for, so I'm keeping my fingers crossed you can help me!

Thanks :)

-maezief

 

Processor: Intel Core i5 or i7, 2.3Hz works great.
RAM: 8GB
I would recommend Windows 7 (64 bit)
HDD: Your own choice, but I'd recommend atleast 750GB
NVIDIA GEFORCE GTX 670M 3GB

Those should be pretty cheap and Minecraft should run atleast at 60 fps.
I can't really tell you about computer parts in English but my friend built a computer with $400 that runs Battlefield 3 with ultra settings. (Fps ~60)

 

What not to get:
Acer.
Windows 8.
Old intel things.
Old computers in general c:

 

Dell. Nuff said.

 

Me:

 

Dat smexy lamp in the background.