OK
Hammock and tarps are not my thing...
Sleeping bag - Rab quantum endurance 600
Sleeping mat - Exped downmat 7
Bivvy bag - If this is being used in conjuction with another form of shelter - something from pertex should do for secondary protection and keep the weight down - as well as being far more breathable than most other products, keeping condensation down.
That combination would be useable throughout the year (you can always vent a warm bag in summer). It is very comfy lightweight and expensive... However, everyone will have a 'take on it' - you could achieve the same level of comfort with a thermarest and an army surplus sleeping bag / bivvi bag - but it would be much more bulky and a lot heavier.... The choices are infinitely variable.
Sorry if that doesn't help much
Edited to add: the Rab quantum is a down bag. You need to do a quick search on the pros and cons of down / synthetic bags before deciding which direction to spend your hard earned cash on.