honest injun help

hello, looking fo a mac of some sort and just need one for my specific needs, dont know much about macs ,i have an old macbook that served me well, i want to sit in my eazy chair with my wireless remote and lighted wireless keyboard and surf the web, thats all i do , i have new canon digi camera i need good photoshop program to edit raw images. and i need a program to write estimates and send invoices to my clients, thinking maybe a i mac with wi fi, i want it to be fast, ,an additional bonus dont know if its possible, i am getting killed on my cable bill , i have suddenlink paying close to 140 a month, have considered latest roku vs mac tv units and need some input,,,,, or can i run my computer screen and stream to my tv using my computer as a roku type unit. any help appreciated

MacBook Pro (i5 or above, at least 4gb ram, 15" or 17" screen) , Adobe Photoshop and an AppleTV.

Once Mountain Lion comes out you'll be able to send your Mac screen over Airplay to your TV. In the interim a mini-displayport to HDMI cable will allow you to connect to your TV.

Hate to sound like the 'grammer police' but capitalising your sentences and a few carriage returns in your posts will make them easier to read and more likely to get replies.