having test driven a IS a while back I could not wait to jump back into my 320D. Even though they are sold as prestige brand I found a 1 series feels more solid and better driven than the IS. If 4 door is your must then a 320D definitely.
Titanium Silver E90 LCI 320D M Sport Saloon
- Logic 7/ USB Connectity and Bluetooth/ Visibility Pack (Xenons, Adaptive Lights,Auto Wipers Lights and Corner Lights) / Sun Protection Glass/M Spoiler / Brake Ducts / BMW Performance Pack / BBS Wheels / SS Cat Back straight through with BCS Backbox