Blind structures, etc. for home SnG

[koko2315]

Hey all,
Been hosting a steady home game for a few months now. Usually get about 10-15 players.

Just got a new set of chips and really want to restructure the blinds, amount of chips to start, etc.

My set is 500 chips. Broken down:
150 White ($1)
150 Red ($5)
100 Blue ($10)
50 Green ($25)
25 Black ($50)
25 Pink ($100)

Here's the problem ... the regulars are used to playing with a ridiculously low starting amount : 25X BB

We usually start with 10 white (10), 5 red (25), 4 Blue (40), 1 green (25)

Mainly, we do this because, we like to speed up the games. And play 3-4 SnG's in a night.

Blinds start at 2/4. And go to 3/6 when 1 player busts out. 4/8 when another busts etc.

I would rather a bigger starting stack and timed blinds.

How should I attack this and wat do you all think would be the best compromise?

I also have the problem of this: If I start everyone off with much more in chips, and the blinds start at say 15/30. All the white chips I just bought are basically obsolete!