Ideapad S400 - what am I losing if I choose Core i3 (Sandy) vs. i5 (Ivy)

Hi everyone,
I'm getting a new Ideapad S400 as a backup PC and my options are restricted to the Core i3 (Sandy Bridge 2375M) and Core i5 (Ivy Bridge 3317U) models. Right now Core i3 is a lot cheaper than i5 in my market (about $150 less).
Question is, am I losing much by going for cheap?
Specifically, would an Ivy Bridge i5 processor bring better battery life or *much* improved performance over the previous-generation i3? I know the S400 is notorious for its low batt life.
As for getting the cheap option and upgrading it, I already have a Samsung 840 SSD and 8GB of RAM waiting for the laptop here, so either model would get the same upgrades.
Thanks in advance for your insights!

hi livino,
Regarding your concerns:
1. With the custom upgrade you have in mind and If you'll be using the Ideapad S400 for basic use (i.e. Stream music/videos, play flash games, etc.), you really won't notice that much difference between the Intel® Core™ i3-2375M Processor (3M Cache, 1.50 GHz) over the Intel® Core™ i5-3317U Processor (3M Cache, up to 2.60 GHz) unless you'll do heavy multi-tasking or a benchmark test (the i5-3317u has Turbo Boost)
CPU Benchmarks:
Intel® Core™ i3-2375M
Intel® Core™ i5-3317U
2. The Intel Core i3-2375m and the Intel Core i5-3317u both have a max TDP of 17W so battery life wouldn't be that noticeable but the I5-3317u have a slight edge on performance when both PC run on battery power as it has a higher clock speed and a bit faster integrated graphics
Integrated Graphics Benchmarks:
Intel HD 3000
Intel HD 4000
If you have a tight budget and will just use the laptop for basic use, the Ideapad S400 with an Intel® Core™ i3-2375M will be sufficient for everyday use.
Regards
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