Coupon effect on house edge

I just got a book of coupons from Las Vegas Advisor (try the site, pretty cool). Anyway, I am wondering how the different coupons affect the house edge. Here are the different types:
1st card is an ace (use it once)
natural pays 2-1 for first hour of play
$5-$25 matchplay (use it once)
natural pays 3-1 (use it once)

All of these coupons limit the bet to $25, most have $5 minimum. Which coupon is mos valuable? I'm a newby KO conter and will save the matchplay and 1st card ace coupons for high counts.