1) Galaxy Tab P1000: The P1000 features a 7 inch display that packs WSVGA resolution. This means that its screen has 1024 x 600 pixels. Battery life of the P1000 is around 5-6 hours which is about 4 hours less than iPad. However, this Samsung tablet is much more portable than the Apple's offerings. It weighs in at 400 grams and is equipped with a 3 mega pixel camera at the back for taking pictures and recording videos. Samsung even gave it a front camera for video calls. Also, unlike iPad, it can make voice calls.
2) Galaxy Tab 7.0 Plus: This is being touted as the successor to the P1000. It has same display size and resolution, but comes with a much faster processor. Its predecessor came with a 1GHz hummingbird processor that had only one core. The tab 7.0 plus has a dual core 1.2GHz processor that makes everything run very fast. Menus and Samsung's TouchWiz user interface are butter smooth. The company also worked hard to make the battery runtimes better than P1000. Now, you will be able to get somewhere around 9 hours with it.
3) Galaxy Tab 7.7: Compared to the 7.0 plus, the 7.7 Tab offers better screen resolution. The slightly bigger 7.7 inch display packs 1280 x 800 pixel resolution. Increased screen resolution means that the pixels are more tightly packed against each another which implies that you will be able to see more data at a time when compared to the 7.0 plus' display. Processor is also tiny bit more powerful. It comes with a dual core 1.4GHz CPU that is 200MHz faster than 7.0's processor. Battery life is 10 hours, thanks to the mammoth 5,100mAh battery.
4) Galaxy Tab 10.1: The 10.1 is the real contender to the Apple's iPad. It has a 10.1 inch screen that features 1280 x 800 pixel resolution, just like Tab 7.7. However, it has just 1GHz dual core processor, but battery life is more than 10 hours. This is chiefly due to its huge 7000mAh battery.
5) Galaxy Tab 8.9: If you want for a tablet with the specs of 7.7, but with a bigger display,