I agree with DrIsotope up to a point, but only up to a point. It's true that at 6'3" I'm never going to be a true climber, one of those who dances up the hills on bird-like ankles. And I suck at climbing when I'm over 205lbs. At 185lbs, though, I can hold my own and outclimb plenty of smaller riders.
[MENTION=200431]Albino Wino[/MENTION], it sounds as if you're bigger built than me and 180 may not be on your agenda. But you're probably more powerful, also. I can tell you that were you back at 220-230 you'd notice a big big difference.

As far as equipment is concerned, I'm afraid part of the answer is money. Higher quality components last longer. If money is tight I'd start by making the wheels a priority and upgrade to some heavy-duty touring wheels as and when you can afford it. And as other stuff wears out, take some advice on what might be a more durable replacement. 25% extra on the price might mean double the lifespan in some cases.

Don't be discouraged. You're a hell of a lot faster than the guys who sit around telling one another how fast they used to be.