Depends on what you want in the camera. How advanced do you want to go with your picture taking. Point and shoot with ease, or point and shoot with advanced features.
The link just takes you to the main dell store page, so that's not going to work. Stay away from sony if you value your money. You'll get less features and more proprietary requirements (sony memory stick vs. sd memory/ sony battery pack vs. AA's).
Canon, Panasonic, Fuji, and Olympus all make fine models for the budget conscious. Most of those should use the standard SD/SDHC memory card. Most point and shoot cameras run on AA batteries. Battery life is dependent on certain aspects of usage, such as screen brightness, ability to turn the view display off/on, anti-shake usage, etc...
For max batt. life, turn the view display down a notch in brightness, and don't use the flash unless you have to. The flash will drain batt's like a kid drains a pixie stick.
As per rechargeable batteries, they're really all about the same. The important factors are type, and how many Milliamp Hours they're rated for. NiMH batteries are fairly standard among rechargeables, so you would want to find a battery that has 2300 or higher as the maH rating for longer use time. However, fine as they may be, they're no match for alkalines even at best. I would recommend chunking down the change for a set of Lithium batteries. They'll last you the longest, so the cost gets absorbed. The ultimate rechargeable batteries tend to be Lithium-Polymer, but they cost a pretty penny making them unfeasable. If you go with lithium batt's and use the power saving tips and tricks, the batt's should last you quite a while.
Amazon is your friend. You can get a better deal on cameras via amazon, which will stretch your purchasing power. Focus on models that have a physical zoom feature. This will allow you to take better images. Digital zoom just blows up the image that you took which will make the image break down more and more the higher you "zoom". This is where your megapixel rating comes into play. The higher the megapixel rating, the less the image will come apart when using digital zoom. The key feature to any camera is resolution. The resolution rating will be listed as something like 3220x2740, in which case, the higher both numbers are, the better.
A flash is a must-have feature for almost anything less than a well lit room. You can learn a few tricks for better low-light photography, but unless you want to spend a lot of trial and error time messing with settings, I'd recommend getting a model with a built in flash unit.
If you need advice on specific models, ask Ivar. He probably knows all about a wide range of cameras, and can help you pick a really good model.