Transport mode suggestion for Hokkaido

I'm planning to go Hokkaido from 25/Jul/2014 ~ 2/Aug/2014. There is only 2 of us, and we plan to cover the below area :
1. Sapporo
2. Otaru
3. Furano, Biei, Ashikawa (northern route)
4. Boboribetsu, Toyoko, Hakodate (Southern route)

Which options is cheaper?
Opt1 : Rental-a-car (cover No.4 & 5 route for about 5~6days)+ Day pass to Otaru
Opt2 : take the 7day Hokkaido Rail Pass?
or any other cheaper options can suggest to me?

solo?

Only 2 of us

any suggestion of the above question?

plus any recommendation for cheap car rental in Hokkaido (not necessarily English website, Japanese website is OK for me too)

Kakuyasu rent-a-car:
http://shiretoko-t.com/en/index79.html

1 and 2 can be explored with train

3. car will be more convenient

4. Can be done either car or train but I opted train to avoid drop off fee and having to concentrate on driving.

Thx guear for the suggestion.

I have the same opinion on Route 1, 2 & 3.

And i shall look into Train option for route 4.
Does anyone know any great train deals for Sapporo-Noribetsu-tokako-hakodate-Sapporo?

I would suggest flying in or out of hakodate to save time and possibly money.

To late on that, I'm flying in and out Sapporo CTS

If you complete sapporo-hakodate between 3 days, 3days hokkaido pass might be good value
http://www2.jrhokkaido.co.jp/global/english/railpass/rail01.html

Sapporo-hakodate one way cost about 8000yen. If your original plane ticket is refundable and you can rebook it to fly out of hakodate for less than that, you might actually save money.

Thx Guear for the tips, but i bought the flight tickets from ANA Experience Japan Fare and it is not permitted to change routing.

however, if i took the 3day train pass back-and-forth Sapporo-Hakodate, it will be the same cost right?

3 day pass will be slightly cheaper than normal tickets.
http://www.japan-guide.com/e/e2361_01.html

is it convenience to use train to connect Sapporo-Noribetsu-Toyoko-Hakodate and return Sapporo? the trains have frequent interval?

About one every hour for limited express. You could check the schedule using hyperdia or google maps.

hi how to buy tablet from Japan is intended for internal market ..?

Anyone know the estimate cost for toll charges and parking fee?

i plan to rent-a-car for 5 days covering Furano & Hakodate area starting from Sapporo.

Or any useful sites can suggest to me for this matter?