E60 will definitely have a bit more room over a E90, it will also be better equipped and more comfortable.

I know the tax is a pain in the hole but this 525d M Sport looks the business if the mileage is genuine. No timing chain on the M57 engine to worry about either:

https://www.donedeal.ie/cars-for-sal...eathe/11813719

A remap will get that up to 530d performance too.

If the higher tax is a problem then this 520d might be worth looking it, it's a 2007 but has the older M47 engine (you can tell by the older automatic gear shifter), looks cared for and has relatively low mileage for the year:

https://www.donedeal.ie/cars-for-sal...ilage/14007223