I started doing extract, partial boils and pitching dry yeast. Then saving yeast and making starters. After 6 batches of decent beer, each batch got better, i was able to score a mash tun and a kettle for $40 and made the jump to all grain 2 weeks ago. As everyone has said, going AG isnt as complicated and scary as it might seem. The only thing was since we were doing full boils we built a 50', 3/8" copper immersion chiller for $55. For the OP, I think the best thing to do would be to get fermentation under control. Making starters, pitching enough yeast, and controlling temperature will have the greatest effect on their beer. Reading up on saving/reusing yeast is also a great way to save money.