Both the 2509 reels for 4X5 and the Expert drums are excellent for sheet film processing.
Using the 2500 system tanks allows you to also process roll film with 2502 reels in the same tank you will use for the 2509 reel.
Expert drums are considered to be some of the best sheet film processing solutions in the world. They are of course, more expensive.
The 3010 will process up to 10 sheets of 4X5.
The 3006 will process up to 6 sheets of 4X5 OR 5X7.