First detector? Relics or coins? Beach or woods, parks or homesites? Gold nuggets ever?
If it's your first I'd buy an Ace 250 for $250, an $80 handheld pinpointer and a good digging tool (Lesche - $35 to $40) and a good set of headphones ($80 to $120), bankroll the balance for a year and see what parts of detecting appeal to you. In a year you've saved back to that $1000, have a good spare or loaner (the 250), have a good idea of what's going on in the ground and can make a better choice. You also won't be overwhelmed with set-up and decisions in using a complex machine. The best machine for gold is not the best machine for coins, is not the best machine for relics, etc., etc.
If you are sure you just want coins from parks and picnic grounds something like a X-Terra 50 or a White's MXT would be a great choice. Jewelry maybe the White's M-6 would be better. If there is any chance of gold nuggets the X-Terra 70 would be worth the extra $. If you hunt old sites with lots of iron trash and deep coins something like a Minelab Sovereign GT would be a better choice.