Maybe you could describe in a bit more detail the climate you intend to use it in? If it will be very hot and humid with lots of bugs, then a tent may be be the best option for you. If not though have you considered a tarp, bivvy, trekking pole combination?
I think others on the forum would be able to advise you better than me, but I expect you would be able to get a light and comfortable setup for $100 with help from people on the forum. The less you carry, the more fun you'll have so I would just forget about a tent if you can and go straight to a lighter option especially for the summer months. Maybe make a post in the Gear section and I'm sure you'll get a ton of advice about where to find the things you would need cheaply. Just an idea.