Looking for a good CPU

AMD FX-8150 Zambezi 3.6GHz Socket AM3+ 125W Eight-Core Desktop Processor FD8150FRGUBOX
$179.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Since you have not stated a purpose for this cpu , just that you want to over clock it to a certian speed . The stock speed on this cpu is 3.6 ghz and you wouldn't be doing much overclocking. You can however overclock this cpu up near 5.0 ghz.
For $200 you won't be able to get an Intel cpu that you can overclock as they need to be an unlocked multiplier. This is as close as you can get to an unlocked multiplier and $200 budget. There are others that you can get but they can only be overclocked slightly by raising the front side buss.

Intel Core i5-2500K Sandy Bridge 3.3GHz (3.7GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor Intel HD Graphics 3000 BX80623I52500K
$219.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Intel Core i5-3550 Ivy Bridge 3.3GHz (3.7GHz Turbo) LGA 1155 77W Quad-Core Desktop Processor Intel HD Graphics 2500 BX80637I53550
$209.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

A cpu like this one has a turbo boost of 3.7 ghz and will be engaged when the system needs the cpu to use the boost. o that it would negate the need to overclock to the 3.8 ghz unless you wanted to go higher.

The fastest you can get for ~$200 is the i5 3550, even though it is clocked lower, because of the more efficient architecture, it will be faster than the FX 8150.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Stay on budget with this one, and you can overclock 400MHz. Ivy Bridge is the way to go.

In my opinion your best choice is a AMD FX 8120.It will overclock lower than a FX 8150 but doesnt really matter since you'll only be pushing it to 3.8GHZ.You can overclock to that frequency even on the stock cooler!

They all look really good thanks, but im just wondering what about this one: http://www.newegg.com/Product/Product.aspx?Item=N82E168...

This one seems really good

I guess with that one you wouldn't have to overclock it since the stock speed is 4.2 ghz.
You still haven't told us what your using this for and it does make a difference. Not everything is all about what the stock speed and what it can be overclocked to.

I will be using this for gaming, Video Editing, HD video watching, multitasking (multiple tabs and windows). here and there photo editing. Also could I still overclock the 4.2GHz one? Thanks

For what your going to be using it for then you do not want an AMD cpu , and I don't care what speed it's at the Intel cpu will run circles aroung an AMD anything.

Intel Core i7-2600K Sandy Bridge 3.4GHz (3.8GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor Intel HD Graphics 3000 BX80623I72600K
$309.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Intel Core i7-2700K Sandy Bridge 3.5GHz (3.9GHz Turbo) LGA 1155 95W Quad-Core Desktop Processor Intel HD Graphics 3000 BX80623i72700K
$319.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Intel Core i7-3770K Ivy Bridge 3.5GHz (3.9GHz Turbo) LGA 1155 77W Quad-Core Desktop Processor Intel HD Graphics 4000 BX80637I73770K
$339.99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

These are what you should be looking at for gaming , video editing , photo editing and HD video watching.

I can understand why you are interested in the AMD FX-4170 Zambezi 4.2GHz , it's because of the price $119.99 andI don't blame you that's a pretty low price but it may not do what you need it to do and then again it may but not at a very good speed even when overclocked.
Yes you can still overclock the 4170 even higher than the 4.2 ghz.
My recomendation is for the Intel cpu but you can do what you choose to do since it's your money and your choice. You came here asking for advice but in the end you can choose to go with your choice regardless of what is recomended.

Intel Core i5-3570K Ivy Bridge 3.4GHz (3.8GHz Turbo) its $230 great for gaming and no need for a overclock but you can if you want to

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

FX series sucks. Don't go for it. I know they are cheap. But a lower clocked sandy or ivy beats FX series very much easily.
Go for http://www.newegg.com/Product/Product.aspx?Item=N82E168...

2500k is best bang for the buck. It slightly exceeds your budget but it's the best to go for.

else if you still can add some more bucks then go for the IVB one:-
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Both can be easily overclocked.