The map pack in the OP will suffice for a bigger map. It doesn't appear to alter the income that much as far as I can see; being larger, it just opens up longer routes, which will naturally earn more, but they take longer to complete. The extended areas can seem a little rough and cartoony in places, but it offers variety and a change of pace. There are many areas you can drive at top speed for extended periods as you can overtake on the hard and soft shoulders in a lot of places.
That with the Real European Companies mod mentioned in the OP is a quick and painless way to make the game better.
On top of those I have a mod that removes the toll booth arms, so they're effectively free and, more importantly, you can go through them at top speed. It makes travelling in France not suck.
http://www.simgamemod.com/?p=1289
I also got a mod that adds an extra 22 AI vehicles, including a Harley, an Italian Ferrari police car and a chav special with a humungous spoiler.
http://www.simgamemod.com/?p=851