Congrats on the purchase, the GT's are great cars. There are a few trim levels:
1. Lusso - 150 BHP, all leather interior, air-con, cruise control, 17' alloys, some have Bose sound system if selected.
2. Q2 - 150 BHP, red stitched leather, Q2 diff, air-con, Bose sound, metal pedals.
3. Blackline - 120/150 BHP, red stitched leather, air-con, cruise control and 18' alloys.
4. Cloverleaf - 150/170 BHP engine with sport button and extras like the Bose sound system and Q2 red stitched leather, it has the Q2 diff, cruise control, air-con and heated seats.
Please correct me if I'm wrong, I may have missed some details but this shows the main differences, either way there really isn't a poor trim and a lot of parts are interchangeable should you wish to go down this route.
The engine you have sounds like the JTD, the JTDm is an updated version from 2006-07 (ish), the m standing for modifica which includes new emission controls and a DPF. A quick phone call to your local dealership should confirm which engine you have, although this thread below is useful:
147 Sport Q2: Autolusso Remap + Swirl Flap & EGR Delete, Mocal Oil Cooler Kit, JTD Performance FMIC Kit + High Flow Elbow, Wizard Downpipe, PF Pads + 5.1 Fluid, Autolusso Braided Brake Lines, MTech Short-Shifter, Autolusso Silicone Turbo-to-MAF Hose, Refurbed Q2's + Some to add later.