If you want a simple opening repertoire, try the Pirc system: play d3 as White and d6 as Black, and do the kingside fianchetto. Every game you play will look like a King's Indian/Pirc.
Or you can try the Hippopotamus system, fianchettoing both bishops and taking a small center. That usually leaves players unprepared, since they don't have clear targets to attack.
I don't intend to take up something like the sicillian dragon. The kind of time something like that would suck up would be immense. I'm looking for a reliable opening that I can learn the basic ideas of and use without lines memorised but more with an understanding of whats going on to make most use of my time available for study.
That's precisely why people take up the Colle. Purdy suggested it because it let people use their time studying tactics rather than lines.
Presisely. I have looked at the colle. Indeed, it is a pain to play agaist as black so its definately a useful and worthwhile opening. especially the colle-zukertort. But my biggest intrigue at the moment is the catalan. If anyone could provide me with more information about either of these openings (or even a solid kick toward a good place to start looking for information) it would be very much appreciated