Not sure how I've missed this thread before.

I really love going to Tsukiji outer market as there are so many things to try from sushi to oysters to uni to grilled seafood.

Some of my recent go to places are:

Iwasa Sushi, similar to Sushi Dai and Daiwa and close to both of those but doesn't have a 4 hour wait. If you like shellfish I highly recommend getting the shellfish set for ~3600 yen.

There are multiple Uni don places at Tsukiji outer market. Most are in small alleys between buildings that connect the main streets/alleys. Most/all of those places are good and typically carry over a dozen types of uni from Japan, China, Russia, Korea, etc. The most expensive dons containing 5 types of Japanese uni will run you around $90USD. That said there is a restaurant that is directly across from the Saito Fisheries Oyster stand, it's called Unitora (note there is more than one unitora) you want to go to the one on the second floor and make a left for the largest overflowing delicious bowl of uni you'll ever see for ~3500 yen.

Sushi Kuni (4-14-15 Tsukiji Chuo Tokyo) which is another place for Uni don at Tsukiji outer market. It's very popular and has very long lines. If you don't want to wait the place next door, BAN-YA Seafood BBQ has uni that's just as good. I've also tried their squid sashimi and it was excellent.

Regarding sushi Zanmai, I'm a fan and go every time I'm in Japan. It's a bit inconsistent visit to visit and store to store but overall great value/qualty for the money. I've probably been to a dozen locations at this point. The original location is about a block away from Tsukiji. Opens at 11am and usually has a line out the door. Last time I was there, there was no line but it wasn't as good as on my previous visits. At least one of their Tsukiji restaurants is 24x7 as are 2-3 other 24x7 restaurants in or near the market. One of those 24x7 restaurants is Tsukiji Sushi Sen which is another chain. Sushi Sen location that is across the street from outer market is very good. Similar to Zanmai but less busy. They have an all squid/octopus set that I like.

If you're in Minato-ku area this place http://www.sushinomidori.co.jp/shop.php?name=akasaka which is apparently another chain, is very good. I stumbled on to this location walking around in the area near my hotel and have gone back to it again on another visit. Don't recall seeing any other tourists on either visit. It's a bit more expensive than Zanmai and is good to go for set menus that have ~12 sushi pieces rather than ala cart.

High end sushi, still not sure how I feel about it. I've been to about a half a dozen 1/2/3 star restaurants and have yet to re-visit any. If I had to pick one to call a favorite I'd probably have to go with Sushi Umi. Haven't been to Jiro and not sure if I want to try it. Really want to try Sushi Saito but have not been able to secure a reservation.