Hiya
To help you make a shortlist of phones, you'll need to do some background research and evaluations. For instance, you mention you want Quad band, and Wifi. Quad band I understand in that you can take the handset to the US and plug in any US carrier that uses SIM cards and use the phone. For wifi, what's the requirement there? is it simply to connect to your home wifi router and sync/swap and move files ? do you wish to connect to your home network in order to connect to spacefacemybook?, browse your local media collection? read emails off your home PC?! connect at Starbucks/Mcdonalds to read news web surfing etc?!
Pending that, are things like screen size, memory capacity, media playback, etc important ?
There's many phones and handsets geared to various aspects if you want such a product. I've read quite good things about the Orange San Francisco for instance, £100 on PAYG get's like 3 out of 5 stars for reviews.. take a look at that?
To help you, here's a few links
http://www.latestmobiledeals4u.co.uk/http://reviews.cnet.co.uk/browse/rating/mobile-phones/mobile/blue/n-6k1-6lk-1z0zl15/http://www.t3.com/reviews/phones/mobile-phonesSamsung are a massive company, covering many industry sectors and have been around 70 years. Their electronics is perhaps what they're best known for in the public eye and their reputation and quality of products have improved substantially in recent years.
do take a look around at other handsets and compare pricing etc on the link above.
Hope this helps!
Cheers, DtM! West London & Slough, UK!