Honestly man my opinion is that if you want to do it, do it properly. For the budget they have in mind and the actual results they want to achieve i personally think the SD2000 is the only way to go. You don't just walk into detecting, you know yourself there is a lot of learning to do so what better way than to jump in the deep end and learn it all properly the first time around.
I've mentioned this before, I started out with the Garrett AT Max but wished that someone would have told me that it wasn't the right machine to find gold with. I did find gold with it but that's because it was sitting on the ground and i didn't have to dig for it (went back with a P.I machine to find out id missed heaps)
I wish someone had have told me that an SD2000 would get the job done right the first time, that's all. If they have limited funds (as i did) the earlier models still have the capability to show real results for the money they can spend, that's all I'm saying.
Good Luck guys, with whatever decision you end up making!