I have the same saw as you (14" Delta w/8" riser block). I purchased it about 15 years ago and it's been a great saw. As someone else said, the accessories depend on what you want to make. The main uses of a bandsaw are cutting curves and resawing. These are the enhancements I've made to/for mine.
The first upgrade is the table and fence. You can buy bigger/better versions than what come with the saw. In my case I made a new, larger top out of solid surface countertop (e.g., Corian), and repurposed the original fence and rails from a Delta table saw after I upgraded it with an Incra fence. I make inserts from 1/4" phenolic plastic and keep a few extras on hand.
The fence allows me to attach a couple of jigs. One is the high fence you see mounted in the picture. The other is the more typical resaw fence that bolts onto the fence (pictured to the left of the blade). I typically use the high fence for resawing and just tune the blade to cut parallel to the fence.
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A feature of the table is the circle cutting fixture. This is the aluminum bar with a pivot point near the end. The bar is milled to slide in a track cut into the table top. A thumb screw underneath (not seen) locks the bar in place. This works great for cutting circles. The only catch is it leaves a small pivot hole at the center of the circle. This usually isn't a problem as it gets hidden during construction.
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This shows a better view of the pivot point. If I reverse the bar the point is at the other end and out of the way for most cuts. If necessary I can remove it completely. Note, I have a resaw blade installed. This is NOT the right blade for circle cutting. With a 1/4" blade you can cut circles down to around 5-6" in diameter.
Over the years I've made a few jigs that slide in the miter track. These are good for cutting small parts that aren't safe to cut on the table saw. I use this one to cut plane wedges. The angle is adjustable. It has a small stop block to set the length. In the picture I have a pattern mounted for illustration, but normally you would slide the piece all the way back to the stop.
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You'll have lots of enjoyment with the saw. It's a good, reliable model.