acer n50 GPS?

i am thinking about an acer n50 pda but which is the best gps system for it and how much.
i am not too bothered about bluetooth for this as it will only be being used in my car...unless the price difference isnt much.
i notice that they advertise the n30 with a gps bundle but not the n50?
i dont want the n30 as you cannot replace the battery--unless anyone can tell me that the unit will last for 5 or 6 years with average use?
can anyone also suggest what software will be best, uk only, but the option to expand/download other maps.
i know lots of questions but i am a total newbie, any help would be appreciated.

Im looking at getting my 1st pda for christmas ! Been on www.ebuyer.co.uk and thought that the Acer N50 Premium was the best option for my budget of £250. I have a few questions about it thow. Looks like this is the right place ! Ill list me questions below and if you know the answer please reply. Thanks in advance.

Would I be able to connect to my wirleless network at home? I have a Netgear DG834GV2 router. Its 802.11b and 802.11g compatible. I understand that this pda can connect to your computer and use your internet connection using a WLAN connection.

What kinda games can you play on this PDA?

What other programs are there that would be usefull?

Thanks again.