Here, here! Sir, you need to listen to your brothers! As someone whose spent most of his life on his feet, I can tell you whole-heartedly that wearing the same pair of shoes (doesn't matter the type) for all purposes is a huge mistake.
Now I'm not telling you to go out and get a different pair for each one of your outfits, but you definately need to get different shoes for different activities. You wouldn't wear a pair of CTs to hunt deer with would you? (now don't get all literal, its just an example!)
So, amount of funds withstanding, get yourself the best quality of shoes you can afford for the different things that you like to do.
You've only got one pair of feet! So, unless you want to walk with a hobble when your older, you'd better take care of them.