I like Visicous brand hi-viz line, but others like other brands. Use what you like in 4-6lb, hi-viz makes it easier to see the line move when the fish are biting light, etc., Look at the B&M poles, they may be cheaper than the St Croix, but some people on here swear by BPS brand rods as well, should probably go shake rattle and hold some rods to see what feels good for YOU. If you plan on using just one rod/reel setup the majority of the time for your style of fishing, then spending the extra $$ may be the right thing to do.
GO BIG ORANGE !
I meant to behave, but there were just way too many other options available at the time.