Tanner Tee. All the way. Don't be cheap. Yes it's costly, but I would say it is one of your more important investments along with a bownet. Your thought process should always be Expenditure vs Investment. A good tee is an investment. Batting gloves and metal cleats are expenditures!
Or a Muhl Tech Tee....prices are fairly close to the Tanner. Has a brush top vs the rolled rubber and some coaches really like the forward arm and outside barrier (helps prevent dipping and casting). My concern might be the durability and strength of the Muhl Tech plastic tube vs the metal of the Tanner, most reports have been that it is extremely durable but not sure if current models are being built to the same standards.
Make your own and you can buy the Tanner 'tee' part. I made the whole tee and used roofing rubber for the tee. I'm cheap......Search the site and the interweb.
Tanner tee can be unscrewed from the base and it fits in your bownet bag. If you plan on being mobile with your tee, go with the regular version. Muhl tech tee is nice also, and serves it's purpose for sure. It's all all about personal preference and how you plan on using it.
I used the UtiliTee for a while, and liked it a lot due to its light weight abd ability to easily fold into my bownet bag. However, the UtiliTee has serious durability issues with their tops, and I finally gave up on it as my everyday tee for the team.
I'm now using a Tanner Tee, and it's been bullet-proof.
I think get the reg version as it's less weight to carry around when you don't need it. You can get a 5 or 10# weight from Walmart or something and put it around the base for added weight of you so desire. Or I use a 20# dumbbell that I already had. The weight is nice but I would nt want to drag it around at a tourny.
Added: my tanner tee is 4 years old this year and has never had a piece replaced. I would use 1 cheapo tee every season prior to and that was with limited use. My $80 tanner has paid for itself twice now