I use my bx25 in a small landscaping business, great for little jobs...no way would I tackle a 4 ft deep 30x30 hole with it for profit, it'd likely take 3 days and if you hit any major rocks, well you'll be renting something bigger anyhow. As for renting 3 pt. equipment, I've only found a couple of pieces for rent locally here, plenty of skid steer equipment for rent though. On the other hand, if you can afford to purchase implements as needed they are much cheaper than skid steer stuff. With the budget you gave I would suggest a 35 to 40 horse CUT without a backhoe, rent an excavator when you need to dig.