i think its only polite for guys to pay for the date...
like what my friend and i always say:
"i won't give my girl any burden"...
as for the budget, i'll say depend on the situation...
eg:
like now i'm not working (in poly):
20 to 40 on normal date,
150 to 200 (present included) for special event (x'mas, valentine,
etc..)
if i got a stable job or so:
50 to 100 on normal date,
200 to 500 on special event...
of course, with such a budget,
i don't expect us to go on date every single day...
maybe bout once or twice a week...
fair enough?