At this stage it's very difficult to predict winners of leagues because the transfer window hasn't even got going. What I start doing now is start ruling teams out of contention for various reasons.
The first reason I rule teams out of contention is if they have a dodgy manager (Nigel Worthington, Bryan Robson, Steve McLaren, Alex mcLeish etc). The 2nd reason is finances, if a team have money issues and you reckon they won't be able to invest in good players. Thirdly, if a team starts the transfer window with a few dodgy signings e.g. not convinced by any of the 3 players Port Vale have signed so far whereas Leeds have signed a few good 'uns and been linked with others.
The 4th reason is just the current playing squad i.e. how they currently match up against the other teams in their league.
As leo mentions; I do a lot of backing of teams with a view to laying them at a later date. This though is only really easy to do on the top 2 divisions because there isn't usually enough liquidity in the market (for me) with the lower 2 divisions.
In an average season I will lay 4 or 5 fancied Championship heavily which could leave me with a £2,000 liability on those teams and with about £400 profit on everyone else. Then as the season goes on I trade almost on a daily basis. On average I win about £400-£500 per season betting like this. Every season bar last season the teams I lay don't feature heavily at the top of the table and I can sell my liability by September/October on most of them.
This season so far;
I am laying Birmingham because I'm not convinced about Clarke as new manager, they have no money and their squad is weaker than last season.
I was going to lay Forest, and i have a little, because they have a manager with a lot to prove still, they have only 1 player worthy of a top 3 team and they WERE short of cash but it looks as if they've just been bought by some rich Arab so I'm going to wait and see what happens. Even if they start flashing the cash though they need a lot of work done before I'd consider them.
I'll lay Derby because I don't think Nigel Clough is a particularly good manager and their squad is thoroughly average.
Laying Middlesbro as their best defender by a mile has done his cruciate again and they've lost their best midfielder, Barry Robson. Also they lack any decent money.
Laying Sheffield Wednesday as they don't have 1 player good enough for the top end of the division and they have plenty who will not be up to Championship standard.
Leeds & Millwall are the 2 teams who have invested well so far. Watford's new owners also own Udinese and Watford will proably be able to avail of some young Italian loanee's during the season. Added to that they have a great young player called Sean Murray who could really make an impact this season. Not sure about Zola as manager though.
I haven't looked to closely at the 1st division yet.
In the 2nd division; Rotherham have signed about 9 players so far and some of them are excellent. With Steve Evans in charge they're gonna be a dominant force this season and are rightly short favourites.
I don't know too much about Fleetwood but they must be decent having won the Conference last season. They've signed quite a few decent players AND 2 dynamite ones up front. If Steven Gillespie stays fit he will tear this league apart, he's Championship-standard and if he stays fit he'll prove it. Up front with him is Jon Parkin who is a monster of a player and will make plenty of space for Gillespie by battering the CB's around the pitch (and he'll bag quite a few goals himself).
For what it's worth; my main bet in the EPL will probably be a back of City winning the league again but I want to see De Jong sold first because he's not good enough and it will show that they're about to sign another top international midfielder.