MH Qs and cost??

[nanoreefer]

hi all, iam thinking of finaly trying MH, i coundent offored it before(cant realy now but) and iam afraid of the heat in summer but if i can find one or two at a good price soon iam going to try it, but i dont know much about MH so i was wondering if someone could tell me,

i was reading that SE bulbs are cheaper then DE but that DE HQI is way better, how true is this?

aside from the initial cost of the lights, can some tell me aprox the monthly cost running either a single 75w(if i get one for my 24g nano) or the cost of two 150s or 250s(for my 75g not sure wich to get 150 or 250)

and besides heat dos anyone have any complaints about there MHs?