Honestly, with all the research I've done, the Garrett ACE250 is probably the best all round beginner machine. It's not complicated to use, has a water proof coil (coil'S if you go with the sports pack plus the extra goodies) and has enough ability to get you finding stuff straight out the box. The downside is that it's simplicity shoots it in the foot in certain conditions and although it works well enough on a dry beach, it's not so hot in the wet and it's fixed ground balance can frustrate users from time to time. But certainly not a bad option to begin with.
I decided to start out on the Minelab X-Terra 705, was a bit of a stretch for me in terms of cost, but I'm one of those that would take the knock and buy the better machine from the word go, rather than complain down the road that I should have. The 705 has all the abilities I could possibly want as a beginner, just download the manual and you'll get the picture. The ACE250 was R4950 and the Minelab X-Terra 305 is also on special at R4950 - so for me, to stretch another R4000 to have top of the adventure range was worth the wait and the money by getting the 705.
Now the X-Terra 305 is the smallest in the range and is in the same price bracket as the ACE250 sports pack, but doesn't come with all the goodies. However, the 305 HAS manual ground balance which really changes the game. Also, by changing between at least three available stock coils (excluding coiltek products which also work), you change the frequency of the coil, giving you great flexibility in the targets you are after, another game changer. It has 2 customizable pre-set discrimination patterns + All Metal mode as well. It lets you select the quietest channels, threshold volume and the amount of tones you want to hear to help you identify targets.
If you put on the 6" 18.75Khz coil (About R1650.00) on an X-Terra 305, you have the very best beginner detector out there in my humble opinion. I used my Wife's 305 with the 6" coil for a while and didn't want to give it back - lol. Super light too.
So in my opinion, the ACE250 Sports Pack or the X-Terra 305 are your choices. But honestly, I feel that the 305 is technologically - the better machine.
DDB