I bought a 51WH36 at the start of the year after finding this great forum, so firstly many thanks to all the old hands for posting such helpful advice. I love my telly and still get a huge grin watching movies, you can't beat projectors in terms of bang for buck - huge screen for comparitively little cash.
Picture quality is brilliant and as I don't watch telly standing up I have no problem with viewing angle. Convergence really is a minor, minor concern after using Demon's service menu convergence guide and if you've not done this yet, give it a go!
But, there are downsides...firstly, size. These RPTVs are big and if you don't have a big lounge/dedicated HC room you need to think carefully about where it's going to go. My lounge is about 4m x 5m, the telly fits but there's only one place it can go, and it's in the corner so not ideal for adding 5.1 speakers (which I'm currently planning). I'd have a similar problem with any other large screen (LCD, plasma etc), but the cabinet-style of the Tosh means any amp/dvd/games console has to go beside rather than under the screen.
I agree the the wh46 would seem to be a serious step backwards, with good quality scart leads I'd probably not miss component video but it's definitely worth having. I'd really miss the Active vision and without it would definitely not buy a Tosh. Every time I skip through the plain 100Hz option I'm reminded how good the active vision is for cleaning up the picture.
Some of the newer DLP RPTVs don't have the problem of the cabinet, they're also thinner so can be placed more easily. Throw in component connections, automatic convergence and I would definitely not buy a WH46 but spend a little extra on the competition. It's missing the best parts of the WH36 without adding anything better than the competition.