Re: Rod Question
Tough question. What kind of water do you fish for trout and bass? What size range of flies are you throwing? What else do you plan to fish for now, soon and down the road? How many rods do you see adding to your arsenal eventually?
Skipping weights helps to cover more bases if you fish for a lot of different things, and if you want to throw different size flies, and cover a lot of different conditions/destinations. A one weight difference, is more of a finesse thing, with just a slight difference in capabilities. If at some point you ended up with a 4,6,8,10 or 3,5,7,9 you'd be pretty covered from panfish, trout, bass steelhead, pike, and inshore saltwater (with the 4,6,8,10 probably a tad more versatile covering a wider range of FW and SW fishing situations IMHO.)
Bottom line, I'd probably do a 4 and 6 if there was a lot of different rods and fishing situations in your future to chase panfish trout and bass now, and add an 8 and 10 down the road. But if you were just going to concentrate on trout panfish and bass, I'd go with a 5 and 7 now (and be covered for large western trout rivers, inland wipers/stripers and steelhead with a 7) and maybe add a 9 for occasional salt on vacations etc at some point.