SEIII

[Fyron]

Download the shareware and find out; its essentially a complete game, just without the higher tech levels (eg: up to cruiser or maybe BC ship size, no stellar manip). The two games have a lot of stark differences, so you can't really say you'd like one just because you like the other.

[Azselendor]

SE3 and SE4 should be considered, in some aspects, cousins and not direct relatives. Aaron made a lot of changes between the two games, such as the build-queue system might throw you for a loop.

And remember -- Right-click when in doubt.