Save up & go for the conversion kit
All you need to change over to 10s is 7.5" or 7.9" Calipers & disks.
Arches group 2's or above for 10x6 also the front arch will need to be cut to allow the wheel to turn
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Also you may need to take your suspension into mind, since doing the conversion i have had to fit adjustable suspension & hi-lows to stop the wheels rubbing on the arches. i also cannot take rear passengers :S
Front arch is not a problem as i put 7x13 alleycats on, so have already trimmed. who's the best to get the conversion kit from? Minispares has a sale on theirs at the moment. I don't have backseats either due to having harnessess so no worries about passengers!