Javelin389t:
I could fish effectively anywhere I go with a 7'0" or 7'6" rod, an 8'0" rod and a 9"0" rod...
You'll get a lot of opinions but I got by with just two rods for a LONG time and IMHO an 8'6" 4wt is good start.
A couple of questions:
1. Do you feel hemmed in at smaller streams with the 8"6" rod and does this happen often?
2. Do you wish you had something longer at the bigger places and does this happen often?
3. Are you JUST fishing for trout?
4. Do you have any plans to do the tight-lining thing?
If the answer to #1 is YES & YES, consider a 7'6" rod.
If the answer to #2 is YES & YES, consider a 9'0" or longer rod?
If the answer to #3 is YES, consider 3, 4 or 5wt rods.
If the answer to #4 is YES, ask someone else as that's not my area of expertise.
In regards to two piece rods, I own several two piece rods. I like them a LOT, a few were not available in anything other than two pieces and there are some rods that don't feel the same in a 3, 4 or 5 piece version, just ask any rod DESIGNER who makes their own blanks or ferrules their own rods.
HOWEVER, finding a two piece rod is a tough thing anywhere except custom or vintage tackle. Neither are a bad thing, I just don't know your preferences or budget.
Good luck