The ACE 250 is a GREAT machine! It's good right out of the box but soooooo much better after you've learned it.
If I were to make a second purchase it would be the Garrett ProPointer. It will drastically cut down your digging time. And...it will cut down the time you're searching through a dirt clod to find the target! Targets that are 2" or less will be "pinpointed" by your Propointer.
Next would be the cheapo Garrett headphones ($26) with dual control so you can 1. tone down the volume of the "bong" noise and 2. keep others from bugging you so much...some people won't bother you if you're wearing headphones (not all....just "some")!
At first you'll probably want to dig it all. No better or faster way to learn your machine than digging it all. A LOT of us put it in the JEWELRY MODE for 90% of our hunting.
When you get tired of digging it all (even in the jewelry mode) you may want to "cherry pick" which is just digging coins. Your face plate has 12 black blocks or segments (and I number them 1 - 12 from left to right). To cherry pick you "notch" out blocks 1 - 8. You'll pick up silver coins (dimes, quarters, etc) and copper pennies (made before 1982). I also leave block #4 to keep the nickels. Your ACE will still highlight all the targets, it just won't make the "bong" noise over them...they're NOT discriminated out, they're just "notched" out...there's a difference! If you wish, you can use your custom mode to put your cherry pick selections and just go from jewelry mode to custom mode.
Save your clad and other coins...mine paid for my sniper coil, headphones, and a Tesoro Vaquero that I use for relics. You'll know when it's time to upgrade...it will be when the "finds" from your ACE 250 pay for what you want!
Am enclosing a chart I made. If you have any questions about it just ask. Hope this helps! DAN