I have never played a Mark V, but I have heard great things about them. When I was looking to purchase, my budget was such that I was not even able to consider a Mark V - it was too expensive as even a used amp. I have had no regrets with my Mark IV.
LP1981 said:
The sounds i'm after are bluesrock to metal like: jimi hendrix, joe bonamassa, Slash/Guns N Roses, Metallica, Ozzy, Megadeth and maybe Children Of Bodom.
For some of these sounds (especially the metal) you will come to love the graphic EQ on the Mark IV. The “classic V” really draws out the metal from the amp. I don’t use the graphic EQ a whole lot. I find that the “classic” tones I am after can be reached via the tone knobs. But the graphic EQ gives you great flexibility with the amp.
LP1981 said:
Also what's best a combo or head when you just play at home?
I am very limited in space, so I went for the combo. It is heavier than a head/cabinet combination. (But, if you are looking at Mesa amps, you already know that they are heavy!) I have two professional grade spring-loaded handles recessed into the sides of the amp. It makes carrying the amp a whole lot easier. I am older an cannot easily carry it up and down stairs, but with the handles it is a snap to get someone in the family to “grab a side and lift”!. Some people may not like modifying the combo like that, but, it was a necessity for me.
GD_NC said:
I can't speak to a Mark V, but the Mark IV is fantastic at low volume. I play mine with my kids sleeping down the hall. No attenuator required.
This should help answer your question concerning volume when using a Mark IV for practice. The Mark IV is a great practice amp. Unlike other amps that I have had that got a lot of their sound from pre-amp distortion, the Mark IV's pre-amp distortion is very, very nice and sweet. I can practice at a very low volume and get a very nice sound.
Plus, as previously posted, the "silent record" feature is indeed pretty slick.
GD_NC said:
The only caveat, you have to completely change your settings when you turn a Mark IV up. Not really a problem, but it leads to a great deal of knob tinkering at your first band practice.
I have not really run into this issue - perhaps I use different settings. The Mark IV manual is great and does give some hints about what to do and what to adjust when playing at a low volume versus trying to cut through a mix.
Again, I have never played through a Mark V. So I know my post is very slanted toward a Mark IV. I don’t think that you will have regrets over a choice of either one of these amps.
One final word (and you may already know this): When “dialing in” your Mesa, use your ears, and not your eyes. The gain and tone controls are interactive. I found that the “start at noon” approach did not work. Instead, I would recommend starting with the sample settings in the manual. Then, play with adjusting the tone controls and learn what they do.
Keep us posted as to your decision.