I would NOT EVER buy or recommend a Sony projector. They simply have lousy customer service and are a complete nightmare of a company to deal with if and when you have issues. They are far to quick to dump their product lines and do not have enough focus on their projectors, especially commercial projectors to have a serious stake in the products.
That said, I plugged in your info at Projector Central and this was the list returned...
http://www.projectorcentral.com/projectors.cfm?g=1&hide=0&st=1&mfg=&p=700&p=3500&w=&r=&br=2500&br=50000&ll=&t=&db=&dt=1&c=&ar=4:3&dvi=2&td=11.5&i=d&is=100&sort=pop&sz=15
My requirements are that it be LCD so you don't run into issues with RBE, that it have at least one digital input, so you are covered with the digital sunset, that the price be under $3,500, which is pretty easy, and that it have at least 2,500 lumens.
Still... 56 results.
We peak out at about 5,000 lumens from this group, and from that list, I think the Sanyo models are the most signifcant quality leader in the bunch.
While not typically known for a lot of quality product, Sanyo is a world class leader when it comes to business projectors with models ranging from several hundred dollars to models running $50,000+. They run the full spectrum, and this model should not only make you happy, but should make you happy for years to come:
http://www.projectorcentral.com/Sanyo-PLC-XM100L.htm
It looks like it ships with the LNS-20 which is a standard lens, and will hit a 100" diagonal size from between 10'11" to 18'9"... Out of the box, you will get a rated 144 lumens on screen. I think that is more than you should realistically expect, but I can tell you that it will be stunning in a way you have not experienced in a long time.
The Toshiba, with only being a couple of years old and with 4,000 lumens was no slouch, but clearly, if you aren't getting replacement parts properly, then you are having headaches that you should not be dealing with so soon as projectors SHOULD last 5-7 years.
Sanyo has a 4,500 lumen model which is a fair bit cheaper which is definitely worth considering as well...
http://www.projectorcentral.com/Sanyo-PLC-XU116.htm
But, the other model is a SIGNIFICANT step up in overall build quality with things such as interchangable lenses and lens shift.
If I were really looking for some nice features in a very reliable manufacturer, then I might go with the Panasonic over the cheaper Sanyo...
http://www.projectorcentral.com/Panasonic-PT-F300U.htm
Lens shift, and a three year warranty, 4,000 lumens, and $2,130. Not to shabby.