A card, some flowers, chocolate M&Ms, a dark chocolate bar, in a nice valentines bag - maybe $25...
For V-Day, you need to be aware of what it is your significant other values. If it's material things, then by all means, go spend - but if it's thoughtful things, then you can probably get by with a little less dough.
Heard on the news last night that the average man spends $165 on his SO for V-Day; vs. $80 that women spend on men.
Hmmmm...wonder who holds the power on this "holiday"?