depends on how you are using the pedals; knowing your how you want to get your tone would make recommending a lot easier if your main gain comes from your amp you'll use your dirt pedals differently than if your use the pedal for your main gain tones i have loads and they all have different characters a good starting point is the Boss SD1. its inexpensive, can cover a lot of ground (clean boost to driven) and is easy to mod i use a pedal into a clean amp, so i use at least 2 drives - a low/ mid gain to boost into a more gainy drive. some people prefer their main drive into a cleaner boost to lift the overall volume for solos. you can also boost or change the character of your tone using clean boosts, eq and compressors. its a bit of a rabbit hole if you go to far one main point - you can get good noises from inexpensive kit now days. don't feel you have to drop hundreds of £/$/€ tone chasing my living room board is relatively straight forward - a keeley comp into a king of klone into a zendrive clone - which pretty much covers everything my big board is frankly over complicated doverdrive -> P'rock -> Overrated ->Manticore -> jubilee -> GE7 (the GE7 is my first real venture into post gain volume boosting/ tone shaping) gives loads of options individually and blended. shame i am not playing madison sq gdns anytime soon... here are some other messes from over the years.