Best Android phone to buy in market

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In my opinion the best Android phones right now is the Samsung Captivate or Galaxy S (Same thing) or the HTC Evo.  Both phones record in full 720P HD video.  the HTC Evo takes better pictures with its 8MP camera, while the Captivate has a 5MP camera.  

HTC Evo
Phone can be used as a router and its own wifi hotspot.  Up to 8 devices can connect to it.  
It has two camera, one on the back for picture and video recording and one at the front for video conferencing.
It has a 4.3 inch screen so easy to view . 
It is also the worlds fastest phone currently in speed since it is on Sprint's 4G network (if available in your state)
Allows speech to text.  While sending a text message you can speak in your phone and it will type the message for you.

Samsung Captivate
Large Super Amoled display which allows a brighter and richer look
Has the SWYPE feature which allows faster texting up to 50 words per minute.
Has alot of memory and easier to carry than the HTC Evo.
Has a longer battery life as well.
Also records in full 720P HD.

As you can see both phones are equipped with great features.  In the end it is for you to decide.

Motorola Droid X

I recommend the Sony Ericsson XPERIA E10i X10 Mini 3G HSDPA Quadband Android Wifi GPS Unlocked GSM Cell Phone. Features include: MP4/H.263/H.264/WMV player. - MP3/eAAC+/WMA/WAV player. - Google Search, Maps, Gmail, YouTube, Calendar, Google Talk. - Google Voice Search (market dependent).

The unlocked Samsung I9000 Galaxy S is the latest unveiled touchscreen smartphone. With the ultra-thin body design as thin as 9.9mm and a light weight 118g, the Samsung I9000 Galaxy S features a stunning sharp 4-inches Super AMOLED display. Running on Android 2.1 Eclair OS with ARM Cortex A8 1GHz processor, I9000 Galaxy S is also composed of a 5.0 megapixel auto-focus camera and capable of recording 720p HD videos. The phone supports WiFi, build in GPS with A-GPS along with 3G, USB, and bluetooth 3.0.