Originally Posted by
snowman
Another factor is how long you plan to use it.
As you get older, you'll probably find things like the D4 harder to read, especially underwater.
Something like the Shearwater or Eon give you bright, clear displays which work in less bright conditions (I don't imagine diving in the NL is much different to the UK) far better than the grey on grey displays of things like the D4 or a Vyper (I started with one of the latter - It's fine, but it was getting hard to read on deeper, darker dives in the UK - I don't know about the D4, but the Vyper has a terrible backlight - Weak and shortlived per push - and shining your torch onto the face just obliterates the display with glare!).
We have a couple of club members with D4s, but, personally, I like to split my dive computer from a watch (I wear a watch as well on most dives) as I find the small format of the D4 and the like too restrictive and hard to read (even in good light), especially for more technical dives.
FWIW, I've got a Heinrichs-Weikamp OSTC Sport - Small, square format which can handle switching gasses - More than you need, OP, right now, but if you progress, who knows? It has an OLED display and is always readable.
If you just want a watch format dive computer for diving in warm, clear water, then a D4 is a good choice. Suuntos aren't perfect, but they're good enough for the majority of divers and dives.
Personally I wouldn't (and don't) bother with an air integration system, they seem pretty hit and miss from what I've seen and, when they do work, seeing you have 45 Bar rather than 'somewhere between 40 and 50, shouldn't be that important, but it's a matter of personal preference.
M