Personally I would consider the Hawk. It was my last module and the one before that was the M2K.
I can honestly say that I have had the most fun with the Hawk. Not too many switches but enough for full immersion. This means as it is a trainer you can concentrate on the flying more than the avionics and let me tell you flying it does well.
Right now we have the SFM which means the edge of performance envelope is not quite as it should be but I would say don't let that put you off.
With the latest updates announced by VEAO and the Hawk pilots views of the pending EFM update I am thoroughly excited for its release in the next few weeks including new training missions and updated cockpit textures. Further down the line I have heard that the Hawk will get it's own campaign all very good news.
Obviously everyone is different so my taste might not be the same as yours. I do think I am with the majority of virtual aviators that own the Hawk and they like it.
It is difficult parting with your hard earned cash when reviews remain limited for these modules. I own FC3, P51, A10C, Huey, Saber, Black Shark, MIG 21, L39, Mirage and Hawk.
If shooting things is your thing then you can still have fun with this module both air to air and air to ground. The Hawk is perfectly suited to screaming through a valley at low level and putting a few rockets on target.
Whats my daily fly? The Hawk. If you like flying and having to think about energy management as with all real aircraft then this module exploits that feeling and with a reasonable turn of speed and performance then this could be your next module. Do your research and makes your choice, L39 is good too but as a Brit it has to be the Hawk for me when it come to jet trainers.
Here is a link to a mission I created and flew. [ame]
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Happy flying...