Mobile AMD Sempron™ Processor 3500
2GB DDR2 SDRAM at 533MHZ, 2 DIMM
ATI RADEON® Xpress1150 with 256MB HyperMemory™

to run WoW on medium settings and i want to be able to pvp and do raids with no lag. Will this do?

Wow is not a very hardware intensive game. You can get rather decent performance out of modest hardware. So what you have selected will do the job just fine.

However the one advantage I have seen with friends that play WoW, a fast hard drive makes up for a lot of lag when loading big maps with a lot of characters...And of course it always helps to have good internet

Alright well if it will run it good then i guess ill be buying it. Does anyone else have other opinions, i am open to anything, The only thing that i will be playing is World of Warcraft. Lookin for no lag on medium settings

And id probably reccomend buying the Athlon 3500 instead of the Sempron.
http://www.newegg.com/Product/Product.asp?Item=N82E16819103633

Its only $1 more and it will be a lot more productive then the sempron. The Athlon has 4x the L2 cache then the sempron and will likley help with load times.