The topic of the best Amiga is hotly contested and has many posts. There is no right answer, largely is a matter of taste.
IMHO, I have a 1200 and a few 3k's(have owned 500, 1000, 3000t, 4000), the 3000 is the best Amiga ever built. It has the least number of compromises and was built like a tank. I think the 3k keyboard is better than the 1200, again this is a matter of taste. It looks the richest and has the best quality feel of any Amiga.
The 3k is nicely expandable and if you deck it out with an accelerator (recommend the Warp Engine 3040 or CS MK III) and a Picasso IV or Retina BLT Z3, you will be very happy with it. NIC's are still around on ebay, recommend either the X-Surf or the Ariadne.
The only things to look out for with the 3k is battery damage, acid destroyed too many 3k's because of neglect. Make sure you see the system run without any video defects and look at the mb to confirm no damage. Video defects are usually caused by mb damage.
Good Luck!
