These only pop-up for sale once every couple of months with good reason. Most people that have them, don't want to sell them. I will certainly regret this (I already am), but I need the cash for a cab that I really want.
Markbass F500. It's been racked since day one and in excellent condition. I am the original owner and I bought the optional rack-ear kit as well.
Semi Para EQ and a ton of other features in a small, light package. Extremely loud and punchy.
Specs --> http://www.markbass.it/product_detail.php?id=94
You have two options:
Head with rack-ear kit: $545
Head with rack ear kit, Power Werks Power conditioner, and 2U rack bag - $645
Notes on the Power Condition and Rack Bag:
Rack bag is in good shape and very durable, but the front zipper is broken. Most upholstery shops or tailors can replace the zipper for very cheap/
The Power conditioner is AWESOME and has the cool feature letting you know how many volts are there via LEDs (great for venues with poor power so you can plug into other power recepticals if one is low. I believe that one of light bulbs in the pull-out illuminators needs replacing. Probably a couple of dollars at your local hardware store.