75C aluminum #2/0 is rated to 135A—You should not go above 125A on 2/0.
I have been in your shoes with this issue before; 2 pole breakers cut your panel capacity in half, so get a larger panel with more breaker spaces than you think you need. If a panel says “12 spaces 24 circuits” then it will only have room for 6 -2 pole breakers; 24 circuits can be made by using tandem breakers and are for 120v only.
In your situation I would put in a 100A sub-panel.
You can buy a 100A SquareD sub panel with main breaker built in (so the lugs in your main panel need a space to connect the feed wires that go to the sub) for about $50 from Home Depot. The 2/0 wire will have no trouble fitting into smaller amperage breakers either.
As far as amperage ratings go for your dryer/tools
a dryer should be on a 30Amp circuit;
your table saw likely only needs 12-2 run to the plug
12g romex = 20Amps
10g romex = 30Amps
8g romex = 40Amps
romex is the same as NM-B
Don’t forget that the feed to the sub-panel includes 4 wires: 2 hot wires, 1 neutral(marked white at each end) and a ground,
Use
2/0 Aluminum for the hot legs
1/0 Aluminum for the neutral leg
#4 copper or #2 aluminum for your ground wire
Sub-panels must have the neutrals and grounds completely separated, with the neutral bus isolated from (not bonded to) the steel enclosure of the sub-panel.
-- I found the board stretcher... finally!
