I can give you my current budget, as a grad student living in an apartment in Toronto (with my boyfriend). My budget is $1500 a month. I spend:

$500 on rent
$50 on cable
$20 on laundry (I typically actually only spend $10 a month on laundry so far)
$50 on cell phone
$320 on groceries and eating out
$105 on a Metropass
$125 on entertainment
$60 on clothes
$100 on personal items (medications, hair stuff, lotion, etc.)
The rest goes to savings

In addition to this I've budgeted for a variety of lump sum expenses (tuition, travel, books, Christmas gifts, etc.). I get my $1500/month budget by taking my entire income for the year (I get lump sum payments because I am paid with scholarships) and subtracting my lump sum expenses. I'm then left with what I can spend every month. Keep in mind that my boyfriend works full time and inevitably he ends up paying for some things for me.

http://www.gailvazoxlade.com/ has some good tips and a spreadsheet for students with lump sum income and expenses.