Manu,
I was one of three owners of an IFR-equipped 150 that we bought because we had kids that were learning to fly age. It worked for the kids and for me. I flew it IFR pretty regularly, as once a week I had to commute from the west side of Michigan to the east side. It was a minimum two hour drive one way. When the weather cooperated, I flew (and I shot some instrument approaches to minimums). The 150 is a wonderful airplane and can do a great deal if you recognize that its speed means range limits and it was designed for Americans of the late 1950s who weighed a lot less than we do now. Make sure that the one you wish to buy has a useful load that is acceptable.
That 150 had a "six-pack" for instruments, but its avionics allowed shooting precision instrument approaches (ILS). A six-pack does not mean that it has limited IFR capability - six-pack just refers to the flight instrument presentation that became standard with all airplanes as of 1968. The ability to fly IFR depends on the avionics installed.
