StoneOfFire,
RE: "this amp sounds great with this new nady parametric in the loop, but with drums it just.. isnt the same.". The most common complaint of this type results when the guitarist has set his bass and presence frequencies such that they compete with the drummer's kick drum and cymbals, respectively. To further complicate matters, the guitarist has also frequently scooped his mids, such that the remaining frequency range in which his signal is unchallenged, the mids, disappears and the result is that his guitar vanishes in the mix.
If the above describes your situation, then switching to another EQ will not solve the problem. You will simply need to cut back on your bass frequencies and your presence and boost your mids back up where they belong so that you can be heard.
Reverb, in and of itself, will do nothing to solve the problem, but it generally won't worsen it significantly as long as the mix of wet-to-dry signal isn't too high.
RE: "i want to convert the effects loop to serial, for the eq.". If your EQ is digital, this will be not just an improvement, but a necessity in order to avoid the phase squeal noise that can occur due to the small lag in digital effects. Such a conversion will be just as necessary for a digital reverb for the same reasons.
RE: "ive asked around and was told to find this "holy grail"..but.. its a pedal.. can it be good?". In a word, yes. In fact, for many types of effects, I would consider the fact that it's a dedicated pedal a plus. Boutique single-effect pedals often surpass their rack unit or multi-effect counterparts in terms of effect quality, and the Holy Grail is a good example.
Ultimately, it's a matter of how much money you have to invest and in your personal tonal preference. One caveat when testing any of them out is do not run them before the guitar's preamp. All reverbs are designed to sound their best at the end of the signal chain, and in the case of a live rig, this usually means putting them at the end of the effects chain within the effects loop. Some people aren't aware of this, so my apologies if this is already obvious to you.