Should i get a new sewing machine or stick to the older model I've got?

I probably have the same Kenmore you do, grad gift in 1975. I got a new Janome a few years ago, and still miss some things about my old machine (which I still have) such as the straight stitch foot and how well it goes over lumps. On the other hand, the new one can do a lot of cool stuff, like monograms, has a rolled hem foot, a 1/4 inch quilting foot, and is so easy to wind the bobbin. I like how easy it is to change the zigzag width and length and easily adjust stitches on the new one. I needed a new one because my old Kenmore began to have stitch-length problems and could no longer do a long stitch for gathering; it just couldn't be repaired any more. The new ones are fun, but do some serious test-driving first.