In the reviews I read, they mostly said not to worry over the drawer, etc, unless that's a particular feature you want/need.
As far as size, I wanted the biggest I could get, but did remember I need to measure my actual table as well, so quite literally got the largest size that would fit where my sewing machine is. My table is long but narrow, so I couldn't get the 24" x 36" one, but got the next size down, with no accessories (via Amazon) so it was something like $108. I've received it but not opened it yet, as it's my Christmas gift....
I figured I could add rulers and things later on if I want, and there are TONS of sources for those, no need to lump them into this purchase when, for me, it was already stretching the Christmas budget (and I wanted room left to get the Machingers gloves and the straight stitch plate for my machine....). I'd say the accessories are up to you, what you think you'll use/need/want.
For ex, I never access my tool drawer while sewing, because I have a separate bobbin box (and I get out alternate feet ahead of time, if I'm going to need them, etc.) and if I need to, mine is on front of my machine so I think I'll be able to reach under and get into it if needed. If I normally was in & out of my drawer all the time, and it was going to be blocked, I'd have made that a higher priority -- does that make sense?