As you'll have seen there are around 20+ 1030.version maps released for different models/regions etc but the main things you need be concerned with are a) does the map cover the country/region you want (UK maybe?) b) is it compatible with my navcore (9510?) c) is there a meta available for it d) what does this map include/support, ie IQ/ALG, Cspeech/ASR etc

An example for the UK map is that the only ones we (currently) have metas for are v1030.9578 (the pretty basic version) & v1030.9519 (fully loaded), both suitable for your 9.510 navcore so your choice