MS Color has a good selection, if you are talking just about your 602Z, with a few filters, a camcorder, a SLR and 2 lens, should fit alright for a 30L (is a 2 layer cabinet). Dont think you will need to pay more than 70-80 for that.
Initially got a "Tropic dry" but it died twice in 9 months. Got sick of it and got a "Toyo Living" for $335 at Cathay, with a 5 year warranty. It's been going strong.
The Tithes folks who service the Tropic dry came and replaced the entire dehumidifying unit (the electronics at the back) with a new one and extended the warranty by a year. That was very good of them - service minded, but let's see how long it lasts.
I'd recommend Toyo Living or Dry Cabi. Both expensive but supposed to be very reliable.