"Is it better to go with 3D-ready-DLP+3DXL instead of Best2D+VIP ?"
Well, if you don't have a projector now and only want to buy one just get a 2D. There really isn't enough 3D content now. If you are buying both projectors and want to keep the total below $2000 just downgrade the 2D projector to an epson 8350, still an excellent projector, but it leaves enough budget for the 3DXL and 3D Dlp.
"if i am going to buy a 3D-ready-DLP, VIP-Theater seems to be more expensive right compared to 3DXL ?"www.google.com
"also i am torn between Acer H5360 vs Optoma gt720...are there better ones in this price range ?"
The gt720 is a short throw projector. If you want really good 3D you may want to upgrade to a high gain screen in the future (or if you don't have a screen now, start with a high gain one like the Da-lite Hi-Power), and the short throw will be a problem there. The Acer 5360 and Optoma HD66 are very equivelant, normal throw projectors. Either will be fine.