The composite Etek 3 seems a great starter gun for the price, basic and you can't really upgrade it.
The Upgradable Etek 3 is good but then you can get a secondhand 08 for the same price.
The Etek has the security of being new and having a warranty and is a good gun.
Ego 08 is also a very good gun with some reasonabley priced upgrades but won't have a warranty so you have to look for a good one.
Personally I would go with an 08, they are reliable and life is easier with an LCD screen.