No prob folks, glad that my simple test helped some of you with your decision.
I must stress that my main aim was to see the extent of heat generation, batt life and performance are secondary, so please factor that in.
Your usage pattern might be different from mine, I'm on my MBA for hours at a stretch but I'm usually plugged in and don't run CPU intensive tasks, mostly word processing n surfing. In this case, both machines performed about the same, performance and heat-wise.
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I forgot to add, I really didn't want to buy both machines at first but the I7 which I first ordered was running kinda hot so I decided to get the I5 and then return the one I felt was better for me.
I really didn't want to waste Apple's money for the shipping, restocking etc. and by posting here in MR, I guess I'm trying to make up for the extra unit I ordered.