Upgrading my Amiga

[Lemmink]

The A2091 does ZII DMA so maybe putting some RAM directly on the card, rather then the ZII RAM on the A2058 an on the A2620, might speed up diskaccess a little bit.
Maybe you will have to reduce the amount of RAM on the A2058 after installing RAM on the A2091, as the total max of ZII RAM is as mentioned 8 MB.
But I wouldn`t invest in such an old pice of hardware. You should really get a faster accelerator tha usually has a way better SCSI-controller. A Blizzard2040 would be a good start and not too expensive. If it is cheap and there is already a decent amount of RAM on the card (it`s practically imposible to get the unique GVP RAMs today, unless you are wiling to pay a fortune) a GVP030 would do also. Stay away from the Apollo2030 as it is totally crappy.

[Lemmink]

Do you mean 27£ for the card or shipping cost alone ?
Personally I would only pay about 50 EUR for this card. The major drawback (of this in all other ways fine lowend card) is that it needs custom GVP-RAM modules for RAM-upgrade. Those GVP-RAMs are hard to get and if you get one, you have to pay for it in gold.

Anyway 27£ shipping cost is a hell of a lot of money and is in no way in balance with the worth of the card.