As I said, TE is the best starting point because it's got more groove to it, much more of a thrash influence. EoV is just relentless is every aspect and traded out the groove influence in favour of more balls-out aggression, which worked perfectly. Both have their individual merits and they're the heaviest albums money can buy.
Time Bomb was, as I mentioned, not supposed to be a Demolition Hammer album. After Vinny Daze (R.I.P. you mad bastard) and James Reilly left the band in 1993 to form Deviate NY (they did a demo called 'Gallery of Death' in 1995), Derek and Steve got in Alex Marquez and wrote Time Bomb as a different band but Century Media refused to issue the album unless it was under the DH moniker, as they believed it would shift more copies. It's nothing like TE or EoV, it's a groove metal album through and through with only about four guitar solos on the whole record. It's still a brilliant album, but the fact that it has Demolition Hammer slapped on it kind of ruins it a little - there's nothing wrong with it really, so long as you bear in mind that it's a completely different band.
If you want a more in-depth analysis of Totured Existence and Epidemic of Violence, I've written reviews for them at
www.brutalism.com so just look the up on there mate. Though to be fair, Demolition hammer were - and still are - so good that you shouldn't need convincing. Also, look up my review for James and Vinny's Deviate NY demo 'Gallery of Death' on Brutalism as well if you're thinking of checking that out.
EDIT: In fact, I'll save you the effort;
Demolition Hammer - Tortured Existence Review:
http://brutalism.com/content/demolition-hammer-tortured-existence
Demolition Hammer - Epidemic of Violence Review:
http://brutalism.com/content/demolition-hammer-epidemic-of-violence
Deviate NY - Gallery of Death Review:
http://brutalism.com/content/deviate-ny-gallery-of-death
I'll have a review for Time Bomb up soon, probably sometime in Febuary. Let me know if there's anything else you need.