Information on Different Tablets

Overall, I think that your best choice would either be the Apple iPad 2 (although the iPad 3 is coming out soon, it might be worth the wait!) or the Motorolla Xoom.

I have found some statistics and tests done by trusted sources, which should also help you decide which tablet to buy:

Form Factor

1ST: PLAYBOOK

193 x 130 x 10mm, 400g

2ND: IPAD 2

241.2 x 185.7 x 8.8mm, 601g

3RD= HTC FLYER

195.4 x 122 x 13.2mm, 415g

3RD= SAMTAB 10.1V

246.2 x 170.4 x 10.9mm, 599g

5TH: OPTIMUS PAD

243 x 149 x 12.5mm, 654g

6TH: XOOM

249.1 x 167.8 x 12.9mm, 730g

7TH: HP TOUCHPAD

240 x 190 x 13.7mm, 740g

Display

1ST= XOOM

10.1-inch, 1280 x 800px, LCD

1ST= SAMTAB 10.1V

10.1-inch, 1280 x 800px, LCD

3RD= IPAD 2

9.7-inch, 1024 x 768px, LCD

3RD= TOUCHPAD

9.7-inch, 1024 x 768px, LCD

3RD= OPTIMUS PAD

8.9-inch, 1280 x 768px, LCD

6TH= PLAYBOOK

7-inch, 1024 x 600px, LCD

6TH= FLYER

7-inch, 1024 x 600px, LCD

Engine Room

1ST= IPAD 2

A5 dual-core 1GHz CPU, 512MB 

1ST= TOUCHPAD

Dual-core Snapdragon APQ8660, 512MB

1ST= OPTIMUS PAD

Nvidia Tegra 2, 1GHz dual-core CPU, 1GB

1ST= XOOM

Nvidia Tegra 2, 1GHz dual-core CPU, 1GB

1ST= SAMTAB 10.1V

Nvidia Tegra 2, 1GHz dual-core CPU 1GB

6TH= PLAYBOOK

1GHz dual-core CPU, 1GB

7TH: FLYER

Single-core Qualcomm 1.5GHz CPU, 1GB

Storage

1ST= FLYER

32GB + SD

1ST= XOOM

32GB + SD

3RD= IPAD 2

16/32/64GB

3RD= TOUCHPAD

32/64GB

3RD= SAMTAB 10.1V

32/64GB

6TH= PLAYBOOK

16/32GB

6TH= OPTIMUS PAD

32GB

Imaging

1ST: OPTIMUS PAD

5MP rear, 2MP front, 1080p video, 3D

2ND: SAMTAB 10.1V

8MP rear, 2MP front, 1080p video

3RD: PLAYBOOK

5MP rear, 3MP front, 1080p video

4TH: XOOM

5MP rear, 2MP front, 720p video

5TH= HTC FLYER

5MP rear, 1.3MP webcam, 720p video

5TH= IPAD 2

Rear cam, front cam, 720p video

7TH: TOUCHPAD

1.3MP front-facing webcam

Battery

1ST=: IPAD 2

10 hours

1ST=: SAMTAB 10.1V

10 hours (probably)

1ST=: XOOM

10 hours

4TH: OPTIMUS PAD

9 hours

5TH: TOUCHPAD

8 hours

6TH: HTC FLYER

4 hours

Apps (updated)

1ST: IPAD 2

Lots and lots

2ND=: HTC FLYER

Quite a few

2ND=: OPTIMUS PAD

Quite a few

2ND=: SAMTAB 10.1V

Quite a few

2ND=: XOOM

Quite a few

6TH=: PLAYBOOK

Not that many (but maybe quite a few)

6TH=: TOUCHPAD

Not that many modern ones

Price (updated)

1ST: HTC FLYER

£420 (Wi-Fi) £560 (3G)

2ND: XOOM

£499 (Wi-Fi only) £599 (3G)

3RD: IPAD 2

£399/£479/£599 (Wi-Fi) £499/£579/£659 (3G)

4TH= PLAYBOOK

$499/$599/$699

4TH= TOUCHPAD

£699

4TH= OPTIMUS PAD

$529.99

4TH= SAMTAB 10.1V

£600-900

Ranking

Ranking is done from the results above:

1ST: Xoom                                          20 points

2ND: SamTab 10.1v (Samsung Tab)   23 points
3RD= iPad 2                                        28 points

3RD= Optimus Pad                              28 points

5TH: PlayBook                                    40 points

6TH: HTC Flyer                                   41 points

7TH: TouchPad                                    43 points