Jim is right in saying that the colour wheel in the Optoma could be a problem if you are prone to rainbows, if you can get a demo then do so, if you are increasing your budget then more projectors are available at good prices, you also don't necessary have to buy brand new. Whatever you buy you should consider purchasing Spears and Munsil 2nd Edition to do a quick calibration.
It all depends on certain factors, do you want 3D, if so then a high lumen output is essential otherwise it's going to be a dimmer experience, if your budget is increased then something like the Benq W1070 might be a great choice, just remember contrast is the weak link with DLP compared to other tech, if you are not prone to seeing rainbows then everything else it excels at, contrast though is very important, some DLP's do have better contrast than others.
If 3D isn't so important i'd recommend a used Sharp XV-Z20000, it has possibly the highest native contrast going for a one chip DLP, it can still be found secondhand, image quality will be superior to any Benq, it just doesn't do 3D, the follow up is the Sharp XV-Z30000 and it's also better than the Benqs and does 3D, prices are high for those so you would need to search secondhand, probably best just going for a Benq W1070 or Optoma HD25 if you are increasing the budget.
The biggest problem for front projection is the room, if you can make the ceiling and walls dark then do so, it improves image quality considerably, especially the ceiling, you can also buy certain screens which can help with the contrast and stop the image being washed out, unfortunately those screens are expensive, here in the UK we have the Draper React 2.1, much better than the Black Diamonds at a fraction of the price, i believe the Draper is sold in the USA but uses an inferior screen material. ( or did )