Based on previously driving both the Altima 2.5 and the Genesis Coupe 2.0 Turbo I would say that you would only notice a slight difference in the performance due to the turbo charger. You will get more of a punch when the turbo kicks in rather than a gradual power increase as seen on the Altima 2.5. I would recommend highly the Genesis Coupe 3.8 judging by your previous history of mods with the Altima. The 3.8 packs a really great punch in stock form and with just a couple of bolt ons it is a great and powerful daily driver. If you wanted to get really crazy with mods and void your warranty you can push the 2.0 turbo to some high numbers but obviously that's a bit more complicated.
2010 Hyundai Genesis Coupe 380GT
M&S Type A Front Grill
KDM 380GT Emblem
Korean Custom Wing Badge Emblem
Injen Cold Air Intake
SuperLux LED Tail Lights
O.Z. Ultraleggera 18x8F/18x9R
E&G Classics Full Aero Kit