Just a few corrections:
1) The A-GPS feature is available to all N95 owners, not just the ones with the N95-8Gb. this feature was enable with a firmware update 18.104.22.168+. It works quite well: I find the fix time dropped from 2 minutes (yes really) to 20 seconds or so.
2) The original N95 never had 4Gb of memory. It has 160mb of internal memory with the possibility of addressing upto 4Gb of memory using a microSD-HC card. On the N95-8Gb, this memory slot is removed to give space for the internal memory. So this model in truth adds 8Gb to the older model.