If you add the radials (or ground plane kit) to an IMAX 2000, that would be your best bet for under $150.00. Solarcon does skimp on their part quality, but the truth is, if you have an IMAX 2000 next to a Maco 5/8th wave, what little difference you see, is in the IMAX 2000 favor.
A gamma match is okay (does have loss), but the IMAX is also a tad longer electrically, and uses copper, which is better than aluminum for performance any day. Granted the difference is very small, but it's better nonetheless.