Mike, I recommend to get the ASA5505 as a home lab, that should be sufficient to get you started with ASA code 7.x and/or 8.03.
Of course, the higher end models have more capabilities in terms of technology supports like mode VLANs, more throughput etc.. so for sake of learning ASA5505 is an excellent product and what you will learn is basically the asa code which you then can apply to higher models.
That price is about right for ASA5505 for basic 10 user lisence which is the base lisence but if you can allocate another $300-400 at a later time you could get unlimmited user lisence which is known as Security plus lisence which will give you 802.1q support for vlans as well as DMZ support in addition to unlimited users outbound connections see link bellow for details.
The ASA 5505 is probably your best bet if you want relevant firewall experience. I've got one here, taken me a week to configure as I have limited Cisco Experience, but got there at the end! Get a copy of the Cisco ASA book, absolute god send!!
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...