Boss pedals are built to last and if you think they provide with "your sound" then don't change a thing. If you feel something specific like "the Boss Flanger" just isn't what I'm going after, then tell us what your going after.
I have two Boss pedals that I'm happy with, the DD-20 and the DS-1. I also have the Crowthar Hotcake, Skreddy Mayo, Buddha wah, Keeley compressor, Option 5 phaser, and a EHX Chorus in my chain. I also have a MXR Flanger and Visual Sound H20 Chor/Echo for standbys.
Depends on the effect. I donlt use that many but -- Keeler for compressor. Keeler modded Boss or TC for chorus. Matchless Hotbox for gain and EQ. Peavy Valveverb (I know its a rack, but it's great) for verb and trem.
I use 3 Boss pedals and an old Digitech delay, I go from effects loop on amp to a HR-2 Boss Harmonist, I use it more as a thick chorus sound than harmonizing or octaves, which it does also. It gives a boost for leads as well if its set right too. Then is a DD-6 digital delay which will warp the sound in very cool ways, even has a reverse simulator, it will delay about 3 seconds I think. Next is a PN-2 Boss tremolo pedal, great for a cool 60's vintage throb on occasion. The old Digitech PDS-1000 has been with me from the early 80's and I use it for 50's slapback echo.
I use an Ernie Ball volume pedal for lead breaks and its like a tank, never failed me yet. All of these have served me well for many years now.
Among the pedals on my board are 4 Boss ones - TU2, Heavy Metal, DD3 and TR2, and on one level I like having them there, because they make me feel like a "grown-up" guitarist - but I also look at them and wish there were more boutique pedals on there - for the snob value. Although I've just managed to get hold of a really beat-up and nasty-looking 1980s Aria Analogue Delay pedal which would harm any potential snobbery merely because of how it looks. Sounds cook as heck, though.