I going to buy a plueger spinning reel and am trying to decide if I should get a size 30 or 35.  Mainly fish 6lb and 8 lb test.

I just bought the 6730 president it holds 115yds of 6#. nice reel for a good price $60

Since you're likely to use 8 pound, you're better off with the 35.

I just bought the 6730 president it holds 115yds of 6#. nice reel for a good price $60

Ya Zero the president was the one I was planning on too. 

I have 8# on a 30 size and it does just fine.  Also have used 8# on a 35 as well since I have one of each.  Only reason I choose one over the other is due to how it balances on the rod.  The 30 is on a 6' rod and the 35 is on a slightly heavier feeling 6'6" rod.  Both cast very well using the Stren original or the Berkley Trilene XL.  However, line twist is an issue and it's worse using these Pfluegers than I've ever had with any other reel.