Unfortunately, with males at this time, it's a case of can't have your cake and eat it too. 

As far as best working model, I'd have to say Apollo. Anton has made considerable clothing available as well, but some items just aren't covered, ie. business clothing. With Bagginsbill's shading system, texturing is pretty much taken care of for use within Poser 5+. Hair is beginning to be fitted automatically to AM by vendors such as AprilYSH, Ali, and lastly FK Designs with her first unisex hairstyle, Paris 65. Using Apollo with V3, it always struck me that V3 was way outclassed. However, the V4 / AM combination looks pretty good to me.

Michael 2, is still very well loved, but I don't know that he has all that much in the way of textures, clothing... and certainly no new items are being made. He's at DAZ, far as I know, he is not free.

David has his fans, can wear all of M3's textures, not much in the way of support for clothing.

M3. Yeah, he has his detractors, but I just love his face. Huge support (for a male figure). Probably has 90% of the male clothing market tied up. And with the advent of a free AM it seemed DAZ stepped up a bit on the support angle. There have been derivatives that claim to work better, joint wise. PDXJims created M3 Revisited, grouped like David, takes all D3/V3 morphs, can wear M3 Clothes and use unimesh textures...  (And, he's on sale 50% off on 7/4/07) poserpros.daz3d.com/store/viewitem.php

I also like the G2 males, but, there's little to no support for them.

Edited to add...
With Apollo Max being free, maybe you should download him and Bagginbill's Shader system and get a feel for whether he'll work for you.  No money spent...

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