Oh boy
Corsair is good for PSU's. If you give them enough money that is. Their cheaper models WORK, yet, their boundaries are way lower then others. Too much stress and bam, you're boned. On the other hand, in certain/most situations, you should be fine.
Read the above for reference on Corsair's CX(M) series!
If you plan to upgrade to i5, I would suggest to plainly wait. Skyrim is more CPU intensive iirc, and believe me, with my second generation mobile i5 (second generation), it's not a dream to run. At all. If you have the choice, save up for an i5.
Also, do you plan to overclock your i5?