Poo, a wee bit of info that might help is tosus out variouse Photgraphy Forums eg; dslrusers.com.au australiandigital photography.com.au(as well as kingtins advice) etc and get the feel of what DSLR's people are using and lens..What problems they are having with each brand, read and ask and then make your move towards a purchase..
I previousely owned an MZ50 Film (Pentax )so had a coupla lens from that and budgetwise i found the best camera to suit me and give me the quallity i needed was a Pentax DSLR so first purchased the Pentax istDS and then moved onto the K10D..
Havent regretted either Camera or lens i purchased with both sets as i was and am an amatuer Photgrapher and will always be so due to timespan left in life lol(not that i'm planning on departing in the near future, just a realist)..
But it dont stop me wanting another Camera or more lens if i won Lotto..
Seriousely though its easy to get eager , go buy an outfit and then six months later say "Darn if i had only studied the market a tad more"..
As for extras for you cameras???wouldnt go past ebay or overseas..
Spare battery for instance for my K10D here the going price was $80 odd , ended up $16 from Honkers at my front door fer instance ..
Leave it at that and wish you luck and sure you will get plenty of help on site here..