Not trying to make this complicated for you, but if you're going to go with two sinkers, I'd be tempted to say you'd get more use out of a type 2 and a say a type 4 or 5. The type 2 is going to pull you down a little quicker, but conversely if you have to fish 15-20' down--and I think you'll find that's not as uncommon as you imagine--something heavier than a 3 will serve you well. Again, not trying to make it complicated, but I think a F / 2 / 5 would be much more versatile than a F / I(1) / 3. Unless you know you're going to be only in shallow lakes.... But, that set-up does leaving you just needing to ad a 6 or 7 on down the road and you'll have the a great range. I dunno, just my thoughts. I'll throw this in too. Rio makes some sinkers in their Mainstream series. I'm not in love with their coatings, though I've had decent luck with their sinking lines. They're decent lines at $40 or $45 instead of $80+. I think they only make type 3 and type 6. I ended up getting them because no one seemed to want to make sinkers in 4 wts, and I wanted a fully-outfitted 4 wt set-up. Do note these don't come with welded tips. If you want loops in the ends and can't add your own (or know someone who can), you may need to pony up for high-end lines. Though with sinkers you can get away with nail-knotting in a permanent mono loop to the tip because you're almost always using short leaders and therefor rarely have to deal with the knot/loop hitting and hanging up on the guides when landing fish.