What is a good desktop to record minecraft?

I would like a good pre built desktop to record minecraft higher than 40 fps. I would also like to be able to get modpacks such as feed the beast or pixelmon My budget is 0-800 USD.

Minecraft 1.7.2 keeps crashing?

Okay so everything is normal until I load a world it works for a second then crashes. It says I joined the game, left with bad state, then tries to delete 1.7.2-natives-268568631012159
Ignoring visibility rule and showing launcher due to a game crash and it can't delete the native file things. I've deleted it and re downloaded the launcher 3 time and it works when I first play it, but then when I get back on later it does this bug. How can I fix this?

How to load a previous save in Minecraft?

So, I was in Hexxit (a modpack) and I saw capsules. There was also a capsule station or something, so I figured it was a workbench. I took the big one and placed it down, right in the middle of my house, and next to all my chests. I clicked and it cleared a 10x10 - ish radius of blocks. The house was inside an overhang too, so it looked natural and that's what my house was, so I can't replace that or any of my items. Please help, my friend will be furious with me if in about a week he logs in to find there's a huge hole where our base used to be!

My minecraft keeps freezing?

Whenever I start playing the game will freeze, then say "not responding" and then I have to close it.Anyone know what the hell is wrong?

What is a good username for YouTube?

I've been to plenty of username generator sites and haven't found a good one. My names is Lauren I just use Kimmy as my username on here because it is my middle name.
I want to become a YouTube gamer and was wondering what a good username would be.
I'm a huge nerd
I'm also kinda a hipster
I love drawing singing and playing video games
I'm 13
I'm funny
I love adventure time and minecraft
I want it to be kinda a funny yet odd name.
I was thinking Laurenthenerd but that just seems stupid. Like I said I've been to plenty of websites. And none of the names have been that good.
Any suggestions for me?

Is 8GB good enough for what I want?

I'm getting an 8GB RAM, 1 TB hard drive computer in a week or so. I'm planning to use it for: autodesk (inventor, max, maya), Microsoft FSX simulator, minecraft, no limits coaster, and screen recording. Is an 8GB computer good enough for the programs I want to use it for? Thanks!

Added (1). I also want to play some steam games like war thunder