wltdwiz gave you great advice. I totally agree with him. I had to make the same decision and decided I wanted more control over my detector when I was gold prospecting. I use gold 1 and gold 2 in the areas I prospect in. Sometimes the ground is so mineralized that I need to reject -9, -8 and -7 to take care of ground noise and hot rocks. Most of the really small gold, smaller than 0.1 grams is going to give you numbers in the -4 to +6 range. If you have some small gold, do some testing. You can also use a slightly adjusted Park 2 by accepting more of the iron range, using 2 tones along many other features and saving it in you custom user profile so you can easily switch back and forth to check targets more fully.
The Equinox 800 with the 6" coil is my second choice behind the Whites Goldmaster 24K and is at least equal to the XP ORX and the Makro Gold Kruzer. For me it was better than the GM 1000 just because I can adjust it much more than the GM 1000, it is waterproof, has a backlight and has a threshold tone. Even though Gold 1 and Gold 2 are limited to one tone, you get plenty of modulation in that one tone, you can raise or lower its base pitch, you can also raise or lower the volume level of that pitch, you can raise or lower the threshold tone pitch so that it sounds more different from the target pitch and you can adjust the threshold volume too, you have iron bias and recovery speed adjustments if you need them, you have onboard pinpointing and you have the Equinox numerical display screen which gives you lots of information.
Jeff