Upgrading from plastic cups?

[huntoften]

I've been using 8-10 oz opaque plastic cups for several years now to pot up my seedlings for sale. I drill a 1/2 inch hole in them and have had very good luck with them. The only complaint I have is that they tend to tip over fairly easily. I can put 24 of them in a 1020 tray and wedge a few more in if I need to. I write the variety name in the sides of each cup with a sharpie. I pot up around 5,000 plants each spring (tomatoes, peppers, herbs, lettuces, and many others) using Craig's dense planting method.

I'm not one to leave well enough alone and I' thinking about "upgrading" to more professional looking containers. I think these "2401" versions would fit my needs:

http://www.greenhousemegastore.com/p...-trays-inserts

I'm thinking I would label the varieties on the rim of the container with a paint type marker as I really don't like using plant tags because they can fall out and then you have no clue what the variety is.

I'm open to any opinions on whether this 24 cell tray is what I need or if there are better options out there. Any advice would be appreciated as I continue to try and improve the quality of the plants I sell.