Hi Greg, welcome to LuLa!
I have owned an Epson 1700, 2000, 2200,2400, 3000, 7800, 9880 and a Canon iPF8300. My experience with the 8300 is still in the honeymoon phase, so I can't comment rationally yet. I like it, and it cost me less than the cost of a set of cartridges during a promo sale. But those all made great prints. I must say, however, that the 8300 and I have yet to have a serious nozzle cleaning war, and that's pretty nice.
No need for a RIP IMHO. Photoshop is happy to apply all the color management you need whilst sending the file to the printer.
Spend the money you would have spent on a RIP on a ColorMunki, Spyder, or other print profiling system. Now that does make a difference. IMHO.
Don't use third party inks. I killed two small printer with those things. At the very best the color will vary from batch to batch, and at the very worst your nozzles will clog forever.
Anyway, glad you're going for a 44". As soon as I bought the 7800 I realized it was too small.