The Steyr AUG A3 does have all that, more or less. I'm not sure why you say the regular AUG doesn't have a bolt hold-open device? I use it all the time and I can assure you that when you fire the last round in a magazine the working parts lock to the rear. At least, the F88 version does.Actually, i vote none of the above.
If i would be the one to decide on a new weapon, i´d want a bullpup-configuration. Faster target aquisition is the main reason for this. I would want a weapon wich accepts the new H&K 30-round Heavy-duty magazines, I want a bolt hold-open device, at least two pictanny-rails, one on top with the new Aimpoint-sight the swedes have on their AK4B (modified H&K G3). And i want a vertical frontgrip on it, with an integrated monopod.
Not one off-the-shelve weapon has this. But closest would be the Steyr AUG A2 with the bolt hold-open device from the AUG Heavy barrel-version. Tavor-21 could be interesting too.
is it heavier than the SA80A2 as that has a fearsome reputation for being a jolly heavy and being heavy with the underslung GLMy only experience is one the heaviest 5.56 assault rifle in the world, the swedish Ak5 (CGA5/FNC 80). It has 8 parts which are very easy to clean. I've used it in heavy rain, ice and snow, crawled in sand with it, banged it hard against walls, stones and trees, dropped it several times and it only jammed one time! During a live firing in wet snow when the 7th bullet(!) clicked. It's very reliable in tough conditions. Divers can use it, the only thing you have to do is shake a little and then you can fire.
On the other hand, it's unbalanced and has 250m/400m sights.
The H&k 416 seems very promising with it's design and the promise of being the least likely rifle to jam in the world.
Standard Ak 5(loaded, 30 rounds) weight: 4,5 kgis it heavier than the SA80A2 as that has a fearsome reputation for being a jolly heavy and being heavy with the underslung GL