Another vote for the EMT140 here. I've been switching out many of my 88RS instances to the new SSL E Ch Strip. I found it more musical than other plugin companies versions which I have. It just sounds great! API Ch Vision hasn't gotten a lot of use for me. Ocean Way is great too especially if you use amp modeling or VIs. Another one I dig a lot is the 610A (the 610B is really good too). Tons of character, usually track bass with this one. There's a lot of great ones but you'll want to demo them and see what works best for your scenario. As someone mentioned check the DSP that each uses. I run 2 Octo's basically, since I don't want to run out of horsepower doing larger mixes for a client. I do use a lot of non UAD plugs too and find when I don't want to max out my UAD instances I'll pull in a comparison non UAD. It's not uncommon for me to use 4-5 different UAD reverbs in a mix, but some in mono so I do save a bit of DSP usage.