Which is the best deal?

Depends. For clock speed bound games go E8400 for CPU bound games that will benefit from Quad (like GTAIV) go Q8200. If using multi threaded apps (encoding, renderings,etc) go Quad.

for 22.00 dollarhttp://www.newegg.com/Product/Product.aspx?Item=N82E16819115131s more i would go for this.

that link messed up my intended post. check out that quad core processor and see what you think. it should be a real winner.

I read somewhere the Q8200 was lame at overclocking due to the already-high FSB speeds (limiting the max FSB overclock).

That is somewhat true due to the Q8200 only having a 7x multiplier.
You should still, however, have no issues reaching at least 2.8Ghz (7x400Mhz) on all but the most extreme budget (or MSI) boards.

An even better option would be the 2.66Ghz Q8400 for $169.99 (only $2 more than the E8400).
That chip will have no issues reaching a minimum of 3.2Ghz on just about every motherboard.

If you end up getting a better Motherboard and RAM your maximum overclock for either CPU will be quite a bit higher.
I would expect any current ASUS or Gigabyte P45 based motherboard to carry you at least to 450Mhz FSB with out to much coaching.

At Q8400 price ranges there are solid Phenom II X4s (3.0 or 3.2 GHz) CPUs which offer better performance than the Qxxx series. That is, assuming you're getting a new motherboard.
For $200 you can't overlook the i5, tho..