Pretty much anything. The thing about Phantasy Star is there are enough options for anyone to do well with pretty much anything. Just find things that you like the look of and use it
That's why it's a guide, work with the community and gather rough prices for stuff so there'll be something a new player can look at to make sure they aren't getting ripped off too much.
That's why it's a 'guide'.
But if it really isn't needed then requesting unpin
Edit: Still would have been nice to have an idea what things might be worth on this server's screwed up economy...
Which is why you price things out as if there isn't an event running and have a second value for event items for prices during events.
It doesn't have to be an exact value, just a rough number.