Hi,Am new here. Seriously consider getting a used UDM. Not sure if to go with 3 series or 5 series. Appreciate your comments on the following to help determine choice:-1. Have a family with 3 kids. So adequate space is important though not critical. Otherwise go for MPV. Impression was E46 backseats and boot are a bit tight vs. E39.2. Ride and comfort - Which one is better? Any big diff? I mean it's bmw quality afterall.3. Power - Heard all over that E46 318 (1.9 or 2.0) and E39 520 (2.0) are underpowered. So, am looking at 525 or 325.4. Maintenance - What's diff btw 525 vs 528 and 325 vs 328. Think performance (hp/torque) is quite similar but any other major diff in terms of maintenance, ride, performance.5. Budget - about 90-100k.6. Any other key things that I need to know. For example I see got many imported model like 323. Better to get CKD and what to watch out for in CBU imported?Thanks!