Ok, read your previous post
userrc and have some thoughts. But first, here are my answers to your questions.
1. Football field would be the smallest. If you go smaller you're basically loosing the ability to do much of anything other then keeping it in the "area". Obviously, the bigger area the better. And like AstroDad said, just fly high.
2. With an EasyStar you're not going to get warp speeds. Even with a brushless motor you will peak out unless you want to rip your wings off. =) Approximate 70mph as a complete ballpark speed for the ES - stock or brushless.
3. Brushed speed controls run about that price. It's an unfortunate reality. You CAN use your 2-cell 7.4V 800mAh Lipo with the stock brushed. UNLESS your 3-cell is a 7.4V (which I'm assuming it is not and that it's a 11.1V) DON'T use it with the stock motor - you'll burn it out. even with a good speed control.
4. Again, based on your experience I can't completely answer this. My girlfriend flies a Mulitplex MiniMag and loves it! I have it set up with brushless and can give you the specks (it's WAY overpowered, but that's because I had the stuff lying around) if you want.
5.HiTech is the cheapest and best quality for the price for mini/micro servos. I have many. Also, Specktrum, though they seem expensive, does offer a Super Sub-Micro Digital servo for around $19 each.
Hi-Tech: http://www3.towerhobbies.com/cgi-bin...&I=LXTX42&P=ML
Spektrum: http://www.horizonhobby.com/Products...rodID=SPMDSP75
Now to answer the rest:
Personally I have seen some great results with the MiniMag from Mulitplex. If you're looking to get some loops/roll/inverted flight - it will do it with the proper brushless set-up. And it will be very gentile to fly when you ask it to be that way. As for durability, I can't say enough about the Elapor foam they use. It's virtually indestructible. You could tank the MiniMag and what wil happen is that the plastic joiner to the main wing will snap - that's all. Oh, and a dented front end (sounds like I've done this before eh?) It's durable.
As for cost? With a modified brusheless set-up you'll be looking at $225 total.
If you're looking at the Trojan, I did a review on Control Chat about it - you can make your decision from there but I will say it's not a beginners airplane for someone new to fixed wing aircraft.
T-28 Trojan Review: http://controlchat.twointeract.com/2...e-t-28-trojan/
Hope all my ramblings help! Take care and good luck!