I would be more than happy to start a new thread with you about the experience level at which we should allow divers to purchase a computer but I don't really know how to split this thread. An educational debate would be entertaining and appreciated but the OP was only interested in which computer to buy, hence my beef.
To start off ours: I may be the exception to the rule but I started diving with a computer only 1 year after certification and was fascinated by the science and methodology of decompression theory. That being said, I always carry back-up tables and pre-plan a dive even though I have 2 computers calculating deco schedules on the fly. I NEVER dive off schedule. Just because I started with a computer, doesn't mean I ended up or started with an empty brain. Computers provide accurate information and a safety net (not substitute), they should not replace ones brain. EDUCATION is key, not the product. If the diver is taught to think critically, I don't see why the computer would prevent him from thinking or provide him a false sense of security. I believe your comment to the OP's friend is quite presumptuous, maybe the kid does know what he's doing. I am interested to hear what you have to say but maybe it should be elsewhere...
Warmly,
Zach