Actually, I think you are better off with H500 if downloading is your main priority. H500 can download double as much as H750UL can in a single month. It can download exactly as much as H1350UL can in a single month. But for the UL plans, you need to keep the internet turned on the whole month 24x7, while in H500 you just need to keep it on during the Night Time Unlimited 2AM to 8AM for 6 hours. So you save 75% electricity compared to H1350UL. And with the power crisis in India, its a good thing if you save power.
i've tried H500, H1000 and H750UL.
As per my calc. i think i can d/load around 70GB if i keep my PC on 24x7 with the H750UL and 140-142GB in H500 and H1000 in night time and around the same with H1350UL if i keep my PC on 24x7. I was gonna get H1350 but my dad made a mistake in filleng the crappy application and im stuck with this ****

which is gonna change next month .
As for keeping the PC on 24x7, i dont mind coz i used to keep it on 24x7 with H500, H1000 also

i dnt mind 11-12k bills.