Hallo,
schau mal hier: (hier klicken) Dort findet man vieles zum Thema VW Golf.
it depends a bit for which purpose you need the battery.... a db-dragger needs other batteries than an SQ-guy, who wants to hear longer time without the engine running...
the datasafes are okay... my car-hifi-dealer uses them a lot and I had a Hawker SBS J40 in my car for quite some time..
worth a closer look are also the PowerCell-batts (like the PC2050, which is absolutly enough for "normal" hifi-purposes)..
other good manufacturers are Optima, Kinetik, Stinger or Northstar (not directly "car-hifi-batteries", but a lot of people use them)...
the GZ-batt will be of one of these "big" manufacturers and will be only labelled as GZ...
in my opinion you don't me such a big battery if you only want to stabilize the power-supply... the Datasafe HX80 or the Powercell PC1100 will be allright for most people... on the other hand, you can't have enough power!
what components have to be powered?
okay... so you mainly need capacity... I think that a lot of batteries will work for you... stick with the well-known names!
I suppose there won't be a big or even noticable difference between a Hawker or a Kinetic... both (and others as well) are good, reliable batteries!
to make a decision compare the ESR- (should be as low as possible), on the Ah- (the capacity - so high as possible) and the short-ciruit- or "boost"-values (the "quickness" of the battery - also so high as possible). that are the main quality indicators...
after that, you can have an eye on the overall impression, especially of the terminals... they sometimes break out of the "box"...
something personal:
I suppose you will throw the J40s out of you car, when you have the new batts, or? any plans with it yet? my own J40 died some weeks ago... replacing it with one of yours would be the easies solution for me, because I would have to make a new housing for an other battery with different dimensions to the J40...
maybe we can make a deal... send me a PM when you though about it.... 
We use the Datasafe a long time with very good results. These batteries are very compact and work well as engine or rear added baterrie, and i think, the Datasafe HX300 is strong enough for you, i use this batterie in my car for engine and carhifi and i´m lucky 
regards
Frank
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