Upgrade to HDMI receiver- totally confused!

[blu-mood]

I want to upgrade my receiver (looking at various Onkyo, Denon, Marantz models), and after reading extensively online, I still have a lot of questions.

Current set up:
Sony KD-34XBR960 CRT TV (1080i, only 1 HDMI input)
Time Warner Cable HD DVR (connected via component to TV & optical to receiver)
PS3 60GB (currently connected directly to TV via HDMI & via optical to receiver)
Onkyo TX-SR502S 6.1 Channel receiver
Athena Micra 6 System with 225W sub (20-100W recommended amp power)

I have no current plans to upgrade the TV or speaker system/sub.

I want to get a receiver that would allow me to connect my PS3 and HD DVR to it via HDMI, but from what I've read, I'd still need to connect the PS3 via optical?

Do I need more than 3 HDMI inputs for the equipment mentioned?

Is it better to buy a receiver with 2 HDMI inputs, then also buy a HDMI switch?

Since my TV only handles up to 1080i, is there any point to buying a receiver that can pass 1080p if I may not buy a larger HDTV for a while?

A lot of assorted receiver reviews indicate that the video passing on many HDMI receivers isn't as good as the audio passing? Thoughts?

I'm leaning towards the Onkyo TX-SR705 or Denon AVR-3808ci, but still can't tell if either or both are more receiver than I need for what I have. Help?