Point 1: Rockets ranging from gross mass of 100Kg to 1000Kg are capable of orbital insertion. (Microlaunchers)
Point 2: DIY space explorers must aim for > LEO due to the fact that LEO is crowded, regulated, and a little boring by now (my paraphrase).
Point 3: For microlaunchers, atmospheric drag becomes significant.
To point 3, I wonder if a launch from high altitude balloon(s) would get us up faster. Any comments or suggestions?