That you are going to get a fairly wide variety of answers here because everyone has their opinions and their "favorite" detectors.
I second the suggestion that you not rush out there and get one - sit down and write down exactly what you are expecting a detector to do for you and what places you expect to do most of your hunting, then take 3-5 of the top choices you have and do a "pro and con" list (maybe use a numbering system or something).
You will quickly find out (if you haven't already) that there is no one machine out there that satisfies everyone for every situation, so there really is no "best" overall detector, just the "best" one FOR YOU!!
Here are some questions to ask yourself when evaluating them:
1. What kind of warranty and/or service does the mfg. provide?
2. Are they reputable?
3. Do you buy from a local dealer who would be there if you have questions, or do you buy it slightly cheaper online?
4. Do I want to find the deepest stuff?
5. Do I want something sensitive to gold?
6. Do I want to hunt in fresh or salt water?
7. Do I want to wade up to the neck or dive?
8. Do I want something relatively easy to use, or something with a longer learning curve, but possibly better in the long run?
9. Do I want to be able to change coils?
10. Do I want to be able to do some land hunting with it too?
There are tons more questions you could ask yourself, and the answer to each one will point to a different "ideal" detector.
Also - You'll hear it here on the forum and the more you detect, the more you absolutely will believe it.....
The detector is an important component of the treasure hunter, but first and foremost it's the person behind the detector and how much they learn to use and interpret their detector that will get you the most "treasure."
Think of it this way - I could go out today and buy myself a set of the most expensive golf clubs in the world, but will they immediately (or even after 4-5 rounds) improve my golf game??? Very likely the answer to that is no. Practice and getting a feel for your clubs and then more and more practice is what will let you get the most out of that expensive set! It's no different with detectors.
Finally - I'll add my $0.02 - these are some of the detectors I would put on your list of choices...
Minelab Excal 1000
Tesoro Tiger Shark
Fisher CZ20 (although I don't believe they are made anymore)
Whites Beachmaster ID
I would hazard a guess that 75%+ of the guys out there use one (or more) of those. Take some other suggestions here and add them to the list (a PI unit or two maybe), then do your due diligence of research, take your best guess considering what you want to do with it and then...
GET OUT THERE AND PRACTICE, PRACTICE, PRACTICE....