The SoftHut catalog hasn't been updated in years, and they don't stock accelerators anymore. Your best bet is going to be ebay, amibay, or ask on the forum.
The Apollo cards generally lack some features compared to the Blizzards (Blizzards have an excellent SCSI add-on and can handle more RAM). However, IMO the Apollos were still good quality boards. They perform well, and in the case of the '060 cards, are easier to overclock (safely) and have fast memory performance.
The best type of card depends on what you want to do. An '030 card with some RAM would be perfect for classic gaming.