Whats the difference in these Mesa Boogie 212 combo amps?

Mesa Boogie F-100 2x12 combo amp

Mesa Boogie Nomad 100 2x12 Combo

Mesa Boogie Trem-O-Verb 2x12 combo

Mesa Heart Breaker 2X12 Combo Amp

What is each best used for. Which would be the best for a Metallica/Dream Theater tone?
Ok but what are the differences of the Amps, the Nomad, F-100 and Trem-O-Verb seem like they are all the same type of amp.
Tremoverb = rectifier with reverb and tremolo but gain is smoother than its recto brothers (Mike Einziger once uses it; check out all Incubus albums before A Crow Left of the Murder to hear what it sounds)
F-100 = based on the mark series (smooth lead tones) and can get a heavy sound due to its contour control

IDK about the others.
I think I'm going to get a F-100. I can't find a place to buy one though, can I get it through the Mesa Boogie website?
The F Series are discontinued and replaced by the Express series (more of a rock / blues amp than hard rock or metal).

There is currently a F-100 combo on ebay right now, but most of the time you are going to be seeing F-30s and F-50s, heads or combos. Best to go ebay, craigslist, or other used sites.
I'd actually go for the Nomad. It's what the DC series turned into, and the DC series is a helluva lot better than current productions Mesas. The Tremoverbs a nice amp (the Incubus records are a great example). F series is basically the older version of the express series, and they're good, but not breakaking. The Hearbreaker's not really a high gain amp, if i'm correct (I believe John Scofield has used it, and Dave Grohl uses it for clean/cleaner tones if i remember correctly).

I'd go for the nomad, or the tremoverb. Both are really great sounding amps.
What I'm looking for is the Metallica distortion tone and a Dream Theater hi gain solo like tone. I know both bands use Mark IIC+ and Mark IV but I can't afford either yet so I want kind of a cheaper Mark IIC+/Mark IV so what will satisfy my needs?
the Nomad series; since it's like a DC head, which is basically a Mark and Recto fusion, you're getting the best of both worlds.
^ Funny, IMO the F-Series is the fusion of the recto and mark series

Well consider this: Nomad, DC, and F series amps are usually found for right at or under $800, Tremoverbs go about $1000-1200, and the Mark Mark IV combo is around $1200, and the head's about a hundred dollars more. All used.
well the F series is basically a 3rd generation DC, so it's all the same.