Synergie wrote:To answer your first question specifically, Android OS is a must, due to the developer base, WP7 isn't well supported enough and iOS-devices (Apple in General) are a NO-GO for me. On a typical day, I would like to listen to about 3hours of music (train trips, walking around the city between Uni classes), watch about 10minutes of video (streaming news reports), *maybe* make a call or two, send a few texts, jump on Facebook for about 10minutes and most importantly, PUSH email & MS Exchange Sync for the entire day. That's a very specific, itemized list of what the battery is going to have to power and as you can see, most of the functions I use are battery-intensive "Smartphone" functions.
Right now I'm with 3, pretty happy with them, if necessary I'll migrate to Vodafone (with the VHA merger and all), moving to another carrier will require a VERY compelling reason, Telstra's NextG network is not necessary for me, I don't live in woop woop and as such do not need to pay the ridiculous premium that is Telstra's way.
I happen to work for a company that deals directly with VHA on both fronts, 3 & Vodafone (preferring not to mention Crazy Johns, ah crap I just did! lol), and personally am sided with 3 for their superior data network.
If you're avoiding the iOS (don't blame you, it's a personal choice) then in the current market I'd be looking at either the HTC Desire Z (currently only stocked on Voda for us), HTC Desire HD (stick with 3 for it) or you can even take a look at the HTC Legend (take the new black version to save messing around updating the OS).
Considering your central location (I assume your pretty close to CBD) you shouldn't have many if any problems with getting a 3G connection and should at bare minimum be reaching the 3.2mbps download rate (7.2 in non-congested areas/times). The reason I mention only HTC is because they do have superior battery life and other current Android phones we have on either of the two networks are rather shite in most departments.
With yourself currently on 3 it's actually a seemless merge to Vodafone if you do want to jump for the Z (an internal process for us as easy as doing a normal upgrade), but bare in mind Voda does have a slightly lesser network whilst we merge our towers over the next 12 months to allow for Voda to "piggyback" our 3G awesomeness. Personally if I were choosing I'd be going for the Desire HD, purely due to the fact that the Z has only just been released and we always wait for at least 2 months before we push a product hard (teething problems in any new "powerhouse" phone are always there).
Honestly for now, if not the phone, the only reason to jump to Voda would be for the Infinite plans we offer now; just watch out for the Data and the very little voice mail & international calls you can use (eg. $45 Infinite only lets you use $45 worth of Voicemail/international calls each month).
It has the largest screen, modest battery life (490hr standby, 5.3hr talktime, turning off your 3G connectivity can push your battery a bit further if you are not intending on using data/calls), the largest screen of the three and pretty nice "fluff" features like 8mp camera, 1.5gb internal harddrive (expandable to 32gb with SD Micro HD), 720p HD video recording & 1ghz processor. Oh and if your into that kinda thing it does tout having Dolby Mobile & SRS "virtual" surround sound