Well, I have to reply since your avatar is DIO ! (correct ?).
If the Excal, CZ21 and BHID300 are out of the picture, then I assume you are looking in the 500-600 dollar range ?
If you are thinking of the 2 units you mentioned, bear in mind they are PI units without any discrimination and if you are hunting in trashy sites, or in freshwater, they may be a little too much to bear. If you are willing to dig every bit of iron, nails, bobbie pins, etc. then those 2 units are good ones.
PI units do very well in salt water and go deep due to the mineralization not effecting them too much, but you will dig deep iron and lots of trash with them.
Are you planning on getting in the water, because then you are in need of a waterproof unit, and all waterproof units are more than the average detector.
The Detector Pro Head Hunter Wader or Pirate Pro are good VLF waterproof units that won't break the bank. Can't dive with them, but if you get swamped by a wave or drop the unit in the water, they are safe. Fisher 1280X is another one that is in the 600 dollar range, but it is also a single frequency detector like the Detector Pro's. Great for freshwater but average for salt water (I do have a HH Wader and it does very well in salt water hunting. Hot on silver and dimes, but for gold its not the best I have).
One of the reasons the Excal, CZ and BHID do better in the salt water environment is due to the multiple frequencies they utilize, which helps cancel out the effects of the salt water conductivity.
One other way to get a unit that is priced to sell is to look in the classifieds, although its hard to tell how much use a waterproof unit has on it and if the owner took care of it or not.
So one of the main questions.....are you salt water hunting and are you planning on getting into the water in knee, waist and chest high water ?
Then again, if you are careful, you can use a unit like an older CZ6a ( which is one of the best beach units I ever used. So good, I bought another one ! And I had an Excal, have a CZ20 and BHID300, other water machines and other land units, but if I know I am only going to hunt the wet sand or the suds up to my knees, I use my 6a on a straight rod mounted under the cuff. Splashproof, multi frequency, salt mode, tone and visual ID, 3 coil options ( 4 if you can find a Sunray FZ-12 !), manual GB...what can I say..I love em ! ).
Sorry for the long winded, non-answer, but it's hard to say without knowing your hunting conditions.
JC