335 or 520-series for home laptop?

My name is Mike and I need to replace the family laptop's hard drive.

We have a circa 2009 laptop.

I will re-install Windows 7 on the new drive (replacing the one that just broke).

We primarily run the Office suite and internet on it.

Some video, but no too much.

The laptop only has 3 Gb of RAM.

I am leaning to an SSD drive over a traditional drive.

A friend in IT recommended Intel over the competition.

Looking at MicroCenter's website, I see two comparable drives... the 335- and 520-series.

It looks like the 520's primarily a bit quicker... but is that speed worth the $30 (sure, "only" $30, but I ask to better understand the technology).

And while these are the two on MicroCenter's site... both 180GB...

http://www.microcenter.com/search/search_results.aspx?N=4294945779+4294964566&cat=Intel-%3a-Solid-State-Drives-(SSD)-%3a-Hard-Drives-%26-Data-Storage-%3a-Computer-Parts-%3a-Micro-Center

(individual drive pages:

http://www.microcenter.com/product/383872/520_Series_180GB_SATA_60Gb-s_25_Internal_Solid_State_Drive_(SSD)

http://www.microcenter.com/product/408640/335_Series_SSDSC2CT180A4K5_180GB_SATA_60Gb-s_25_Internal_Solid_State_Drive_(SSD) )

Would I be better off paying extra for the 240 GB 335-series - http://www.microcenter.com/product/400663/335_Series_240GB_25_SATA_6Gb-s_Solid_State_Drive_(SSD)_SSDSC2CT240A4K5 ?

Which should we get?

Thanks,

Mike