The ESP Guitar Company

I recently got an ENGL Fireball, which is 2 years old and has been played every week during band rehearsal for about 1,5 years. I dont have a good cab yet, but I played it on my brothers fake Marshall cab. Could be the cab, but I think it sounds less lively than my friend's new Fireball. It doesnt make weird noises or anything tho :p But would you guys reccommend a re-tube or should it be ok to play and gig for some time to come ? If so, what would be the best tubes ? I asked some store and this is what they recommend for a Metal sound: 1x Shuguang 12ax7 V1 2x Shuguang 12ax7 1x Electro Harmonix 12ax7 Balanced 2x Electro Harmonix 6l6GC Price €61,40 incl. matching of the powertubes. Your thoughts ?