Greetings! Several years ago I purchased a D40x for a trip to Yosemite. It worked wonderfully and I was pleased with the performance. Life happened and I had to take a step back from tinkering around with photography. So here I am with trip to Yellowstone coming up in a couple months and I'm wondering, should I upgrade? I'd like to keep the price under 1,000. Is it safe to assume the lenses I have would still work with a new body?