I had a fast 5wt that I bought in 2004, and tried to cast #10 Clousers with it. In close, it was fine. Casting beyond 30 feet was tough, but then I learned the oval cast and I was good for another 10-15 feet.
I bought a $75 Cortland GRX 6wt, and that made life so much easier. I now own an even faster 5wt that will cast those same Clousers with ease, but it's much more pricey than the Cortland.
I always use floating line BTW.
I'd say if you want a budget rod, go 6wt.