Since I'm new here, I don't know what tools or equipment you currently have. I also don't know what type of work your doing or planning to do in the near future.
Sounds like the members have some very good choices for you to choose from above.
If you are into machining, I would be looking at Mag base ( Noga mentioned above would be my choice as well ) I prefer Interapid indicators but something cheaper may work for you.
A Noga deburring tool comes in handy as well, many different blade choices.
A Dremel with a couple carbide burrs come in handy all the time.
If your drilling with HSS/cobalt rather than Carbide drills. I use different diameter threaded rods/lengths for deburring holes inside tube or opened up round stock. ( S7 is good, tough threaded rod for this purpose) Dremel for intersecting holes.
An Indian stone comes in handy as well.
Especially, when you drop a tool holder... Yes, with a cutter/drill bit in it... onto your milling table when switching out tools " Just because it will happen." Also, good for stoning the bottom of your vice after it sits in 1 spot for tool long on the mill.
Let us know what you decided to purchase once you pull the trigger if you don't mind.
I received some Amazon gift cards and looking for suggestions on tools/materials/parts to spend it. What are some good deals and in stock items that you would recommend?! Thanks