big seeds aren't a very good indication of what the strain is. why don't you just germinate them and see what they are?
the downside of getting seeds over a clone is you have to wait a couple of months before the seedlings become suitable to clone.
you could see if he would drop the price a little, if he is a friend he should. some folks will sell clones for as little as a couple of dollars, but there is usually a minimum amount that you have to buy. some dispensaries around here (CO) sell clones for between $10 and $30 depending on strain, size, etc...
on the upside if you do get the clone you could take more clones off of it as soon as it is big enough to cut them. none of that waiting for seedlings to show sex.
plus if you are gonna buy seeds why get a lame strain like big bud (no offense). in this game its about quality not quantity. I have never heard a stoner say "man i wish i could still find that big bud..."
-ss