I too have always had a passion for "all things underwater" but I've always been more of a fan of the saltwater variety.
In my opinion, Marine fish are much more sensative to water/living conditions than freshwater fish however their variety and appearence certainly make up for the extra work you'll need to put in. Over the years, I've set-up and maintained a number of saltwater tanks all with varied levels of success. That's one reason I still consider myself a beginner.
I find that I do a ton of research upfront and I'm not one to skimp on supplies/equipment but I've always fallen behind on the maintenance necessary to keep a marine aquarium running successfully for an extended period of time.
I'm currently in the process of setting up a 92G corner tank I bought about 6 years ago. I had it running for about 4 years before things started to go downhill.
This time I purchased a RO
unit so I could make my own water which should help me stay up on the required bi-weekly or monthly partial water changes. I found out long ago that most tap water just doesn't cut it with marine fish and having to rely on transporting RO
water from my LFS
turned out to be to much work for me.
All I can say is take your time, do your research and save your money because you'll need it.