The magazines tend to cycle through common subjects over the course of the year. Landscape, portrait, macro, night shots, wildlife etc.
I quite like Digital Photographer magazine. Nice articles, reviews etc and a DVD with tips on using photoshop/lightroom to do post production. Digital Camera magazine is almost identical. I tend to just pick either up depending on the articles that month.
But, there are a lot out there and they're all very similar so any would probably do.