I have engineered a Courier and a Cobra Mk3. The Courier is insane, DD lv 4 drives (485 boost speed), reinforced shields G5 so with a heavy duty booster its over 700mj of shielding and a decent jump range, over 17 lys if I recall correctly.
The cobra has similar mods and with the DD it does over 500 on boost
jump range is 39 lys with all A rated internals however the shields are a lot less than the Courier. Both are immense fun to use both mission running and in RES.
The Courier easily holds its own in CZ's as well. Weapon wise it has 2 x C2 G5 burst with Efficient mods and 1 x C2 Plasma Accelerator currently unmodified.